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Jul 12, 2016 am 08:49 AM
yii2 source code study notes (19), yii2 source code study notes
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<span> 1</span> <span>/*</span><span>*
</span><span> 2</span> <span> * @return string|boolean the view file currently being rendered. False if no view file is being rendered.
</span><span> 3</span> <span> * 當(dāng)前正在渲染的視圖文件
</span><span> 4</span> <span>*/</span>
<span> 5</span> <span>public</span><span> function getViewFile()
</span><span> 6</span> <span> {
</span><span> 7</span> <span>return</span> end($<span>this</span>-><span>_viewFiles);
</span><span> 8</span> <span> }
</span><span> 9</span>
<span> 10</span> <span>/*</span><span>*
</span><span> 11</span> <span> * This method is invoked right before [[renderFile()]] renders a view file.
</span><span> 12</span> <span> * The default implementation will trigger the [[EVENT_BEFORE_RENDER]] event.
</span><span> 13</span> <span> * 前置事件，執(zhí)行[renderFile()]時(shí)被調(diào)用，默認(rèn)觸發(fā)[[EVENT_BEFORE_RENDER]]事件
</span><span> 14</span> <span> * If you override this method, make sure you call the parent implementation first.
</span><span> 15</span> <span> * @param string $viewFile the view file to be rendered. 要渲染的視圖文件。
</span><span> 16</span> <span> * @param array $params the parameter array passed to the [[render()]] method.
</span><span> 17</span> <span> * 參數(shù)數(shù)組傳遞到[render()]方法。
</span><span> 18</span> <span> * @return boolean whether to continue rendering the view file. 是否繼續(xù)渲染視圖文件。
</span><span> 19</span> <span>*/</span>
<span> 20</span> <span>public</span> function beforeRender($viewFile, $<span>params</span><span>)
</span><span> 21</span> <span> {
</span><span> 22</span> $<span>event</span> = <span>new</span> ViewEvent([<span>//</span><span>實(shí)例化ViewEvent</span>
<span> 23</span> <span>'</span><span>viewFile</span><span>'</span> =><span> $viewFile,
</span><span> 24</span> <span>'</span><span>params</span><span>'</span> => $<span>params</span><span>,
</span><span> 25</span> <span> ]);
</span><span> 26</span> $<span>this</span>->trigger(self::EVENT_BEFORE_RENDER, $<span>event</span>);<span>//</span><span>觸發(fā)[EVENT_BEFORE_RENDER]事件</span>
<span> 27</span>
<span> 28</span> <span>return</span> $<span>event</span>->isValid;<span>//</span><span>判斷是否繼續(xù)渲染文件</span>
<span> 29</span> <span> }
</span><span> 30</span>
<span> 31</span> <span>/*</span><span>*
</span><span> 32</span> <span> * This method is invoked right after [[renderFile()]] renders a view file.
</span><span> 33</span> <span> * The default implementation will trigger the [[EVENT_AFTER_RENDER]] event.
</span><span> 34</span> <span> * 后置事件，在執(zhí)行[renderFile()]方法后被調(diào)用，默認(rèn)觸發(fā)[[EVENT_AFTER_RENDER]]事件
</span><span> 35</span> <span> * If you override this method, make sure you call the parent implementation first.
</span><span> 36</span> <span> * @param string $viewFile the view file being rendered.要渲染的視圖文件。
</span><span> 37</span> <span> * @param array $params the parameter array passed to the [[render()]] method.
</span><span> 38</span> <span> * 參數(shù)數(shù)組傳遞到[render()]方法。
</span><span> 39</span> <span> * @param string $output the rendering result of the view file. Updates to this parameter
</span><span> 40</span> <span> * will be passed back and returned by [[renderFile()]].
</span><span> 41</span> <span> * 返回視圖渲染的結(jié)果
</span><span> 42</span> <span>*/</span>
<span> 43</span> <span>public</span> function afterRender($viewFile, $<span>params</span>, &<span>$output)
</span><span> 44</span> <span> {
</span><span> 45</span> <span>if</span> ($<span>this</span>->hasEventHandlers(self::EVENT_AFTER_RENDER)) {<span>//</span><span>判斷[EVENT_AFTER_RENDER]事件是否存在</span>
<span> 46</span> $<span>event</span> = <span>new</span><span> ViewEvent([
</span><span> 47</span> <span>'</span><span>viewFile</span><span>'</span> =><span> $viewFile,
</span><span> 48</span> <span>'</span><span>params</span><span>'</span> => $<span>params</span><span>,
</span><span> 49</span> <span>'</span><span>output</span><span>'</span> =><span> $output,
</span><span> 50</span> <span> ]);
</span><span> 51</span> <span>//</span><span>觸發(fā)[EVENT_AFTER_RENDER]事件</span>
<span> 52</span> $<span>this</span>->trigger(self::EVENT_AFTER_RENDER, $<span>event</span><span>);
</span><span> 53</span> $output = $<span>event</span>->output;<span>//</span><span>返回結(jié)果</span>
<span> 54</span> <span> }
</span><span> 55</span> <span> }
</span><span> 56</span>
<span> 57</span> <span>/*</span><span>*
</span><span> 58</span> <span> * Renders a view file as a PHP script.
</span><span> 59</span> <span> * 返回一個(gè)視圖文件當(dāng)作PHP腳本
</span><span> 60</span> <span> * This method treats the view file as a PHP script and includes the file.
</span><span> 61</span> <span> * It extracts the given parameters and makes them available in the view file.
</span><span> 62</span> <span> * The method captures the output of the included view file and returns it as a string.
</span><span> 63</span> <span> * 將傳入的參數(shù)轉(zhuǎn)換為變量，包含并執(zhí)行view文件，返回執(zhí)行結(jié)果
</span><span> 64</span> <span> * This method should mainly be called by view renderer or [[renderFile()]].
</span><span> 65</span> <span> *
</span><span> 66</span> <span> * @param string $_file_ the view file. 視圖文件
</span><span> 67</span> <span> * @param array $_params_ the parameters (name-value pairs) that will be extracted and made available in the view file.
</span><span> 68</span> <span> * @return string the rendering result 執(zhí)行結(jié)果
</span><span> 69</span> <span>*/</span>
<span> 70</span> <span>public</span> function renderPhpFile($_file_, $_params_ =<span> [])
</span><span> 71</span> <span> {
</span><span> 72</span> ob_start(); <span>//</span><span>打開輸出緩沖</span>
<span> 73</span> ob_implicit_flush(<span>false</span>); <span>//</span><span>關(guān)閉緩沖區(qū)</span>
<span> 74</span> extract($_params_, EXTR_OVERWRITE);<span>//</span><span> 將一個(gè)數(shù)組轉(zhuǎn)換為變量使用</span>
<span> 75</span> <span> require($_file_);
</span><span> 76</span>
<span> 77</span> <span>return</span> ob_get_clean();<span>//</span><span>得到緩沖區(qū)的內(nèi)容并清除當(dāng)前輸出緩沖</span>
<span> 78</span> <span> }
</span><span> 79</span>
<span> 80</span> <span>/*</span><span>*
</span><span> 81</span> <span> * Renders dynamic content returned by the given PHP statements. 渲染動(dòng)態(tài)內(nèi)容
</span><span> 82</span> <span> * This method is mainly used together with content caching (fragment caching and page caching)
</span><span> 83</span> <span> * 用來聚合緩存的內(nèi)容
</span><span> 84</span> <span> * when some portions of the content (called *dynamic content*) should not be cached.
</span><span> 85</span> <span> * The dynamic content must be returned by some PHP statements.
</span><span> 86</span> <span> * 渲染某些被PHP語句返回的動(dòng)態(tài)內(nèi)容
</span><span> 87</span> <span> * @param string $statements the PHP statements for generating the dynamic content.生成動(dòng)態(tài)內(nèi)容的PHP語句。
</span><span> 88</span> <span> * @return string the placeholder of the dynamic content, or the dynamic content if there is no
</span><span> 89</span> <span> * active content cache currently. 動(dòng)態(tài)內(nèi)容占位符 如果當(dāng)前沒有有效的內(nèi)容緩存，調(diào)用evaluateDynamicContent輸出
</span><span> 90</span> <span>*/</span>
<span> 91</span> <span>public</span><span> function renderDynamic($statements)
</span><span> 92</span> <span> {
</span><span> 93</span> <span>if</span> (!empty($<span>this</span>->cacheStack)) {<span>//</span><span>動(dòng)態(tài)內(nèi)容的列表不為空</span>
<span> 94</span> $n = count($<span>this</span>->dynamicPlaceholders);<span>//</span><span>統(tǒng)計(jì)動(dòng)態(tài)內(nèi)容條數(shù)</span>
<span> 95</span> $placeholder = <span>"</span><span><![CDATA[YII-DYNAMIC-$n]]></span><span>"</span>;<span>//</span><span>生成占位符</span>
<span> 96</span> $<span>this</span>->addDynamicPlaceholder($placeholder, $statements);<span>//</span><span>添加動(dòng)態(tài)內(nèi)容占位符</span>
<span> 97</span>
<span> 98</span> <span>return</span><span> $placeholder;
</span><span> 99</span> } <span>else</span> {<span>//</span><span>沒有有效緩存 執(zhí)行傳入的PHP語句，返回執(zhí)行結(jié)果</span>
<span>100</span> <span>return</span> $<span>this</span>-><span>evaluateDynamicContent($statements);
</span><span>101</span> <span> }
</span><span>102</span> <span> }
</span><span>103</span>
<span>104</span> <span>/*</span><span>*
</span><span>105</span> <span> * Adds a placeholder for dynamic content. 添加一個(gè)動(dòng)態(tài)內(nèi)容占位符
</span><span>106</span> <span> * This method is internally used. 內(nèi)部使用
</span><span>107</span> <span> * @param string $placeholder the placeholder name 占位符名稱
</span><span>108</span> <span> * @param string $statements the PHP statements for generating the dynamic content
</span><span>109</span> <span> * 生成動(dòng)態(tài)內(nèi)容的PHP語句
</span><span>110</span> <span>*/</span>
<span>111</span> <span>public</span><span> function addDynamicPlaceholder($placeholder, $statements)
</span><span>112</span> <span> {
</span><span>113</span> <span>foreach</span> ($<span>this</span>->cacheStack <span>as</span><span> $cache) {
</span><span>114</span> $cache->dynamicPlaceholders[$placeholder] = $statements;<span>//</span><span>添加動(dòng)態(tài)內(nèi)容占位符</span>
<span>115</span> <span> }
</span><span>116</span> $<span>this</span>->dynamicPlaceholders[$placeholder] = $statements;<span>//</span><span>給當(dāng)前視圖添加動(dòng)態(tài)內(nèi)容占位符</span>
<span>117</span> <span> }
</span><span>118</span>
<span>119</span> <span>/*</span><span>*
</span><span>120</span> <span> * Evaluates the given PHP statements. 給定的PHP語句的值
</span><span>121</span> <span> * This method is mainly used internally to implement dynamic content feature.內(nèi)部使用實(shí)現(xiàn)動(dòng)態(tài)內(nèi)容功能
</span><span>122</span> <span> * @param string $statements the PHP statements to be evaluated. PHP語句進(jìn)行計(jì)算
</span><span>123</span> <span> * @return mixed the return value of the PHP statements. PHP語句的值
</span><span>124</span> <span>*/</span>
<span>125</span> <span>public</span><span> function evaluateDynamicContent($statements)
</span><span>126</span> <span> {
</span><span>127</span> <span>return</span><span> eval($statements);
</span><span>128</span> <span> }
</span><span>129</span>
<span>130</span> <span>/*</span><span>*
</span><span>131</span> <span> * Begins recording a block.
</span><span>132</span> <span> * This method is a shortcut to beginning [[Block]]
</span><span>133</span> <span> * 數(shù)據(jù)塊開始的標(biāo)記，該方法是開始[Block]的快捷方式
</span><span>134</span> <span> * 數(shù)據(jù)塊可以在一個(gè)地方指定視圖內(nèi)容在另一個(gè)地方顯示，通常和布局一起使用
</span><span>135</span> <span> * @param string $id the block ID. 數(shù)據(jù)塊標(biāo)識(shí)
</span><span>136</span> <span> * @param boolean $renderInPlace whether to render the block content in place. 是否渲染塊內(nèi)容。
</span><span>137</span> <span> * Defaults to false, meaning the captured block will not be displayed.
</span><span>138</span> <span> * @return Block the Block widget instance 數(shù)據(jù)塊部件實(shí)例
</span><span>139</span> <span>*/</span>
<span>140</span> <span>public</span> function beginBlock($id, $renderInPlace = <span>false</span><span>)
</span><span>141</span> <span> {
</span><span>142</span> <span>return</span><span> Block::begin([
</span><span>143</span> <span>'</span><span>id</span><span>'</span> => $id,<span>//</span><span>數(shù)據(jù)塊唯一標(biāo)識(shí)</span>
<span>144</span> <span>'</span><span>renderInPlace</span><span>'</span> => $renderInPlace,<span>//</span><span>是否顯示標(biāo)識(shí)</span>
<span>145</span> <span>'</span><span>view</span><span>'</span> => $<span>this</span><span>,
</span><span>146</span> <span> ]);
</span><span>147</span> <span> }
</span><span>148</span>
<span>149</span> <span>/*</span><span>*
</span><span>150</span> <span> * Ends recording a block. 數(shù)據(jù)塊結(jié)束標(biāo)識(shí)
</span><span>151</span> <span>*/</span>
<span>152</span> <span>public</span><span> function endBlock()
</span><span>153</span> <span> {
</span><span>154</span> <span> Block::end();
</span><span>155</span> <span> }
</span><span>156</span>
<span>157</span> <span>/*</span><span>*
</span><span>158</span> <span> * Begins the rendering of content that is to be decorated by the specified view.
</span><span>159</span> <span> * This method can be used to implement nested layout. For example, a layout can be embedded
</span><span>160</span> <span> * in another layout file specified as '@app/views/layouts/base.php' like the following:
</span><span>161</span> <span> * 開始指定的view渲染內(nèi)容，用來實(shí)現(xiàn)嵌套布局，傳入的第一個(gè)參數(shù)為布局文件的路徑
</span><span>162</span> <span> * ~~~
</span><span>163</span> <span> * <?php $this->beginContent('@app/views/layouts/base.php'); ?>
</span><span>164</span> <span> * ...layout content here...
</span><span>165</span> <span> * <?php $this->endContent(); ?>
</span><span>166</span> <span> * ~~~
</span><span>167</span> <span> *
</span><span>168</span> <span> * @param string $viewFile the view file that will be used to decorate the content enclosed by this widget.
</span><span>169</span> <span> * This can be specified as either the view file path or path alias.布局文件的路徑或路徑別名。
</span><span>170</span> <span> * @param array $params the variables (name => value) to be extracted and made available in the decorative view.
</span><span>171</span> <span> * 可以在視圖中運(yùn)用的參數(shù)
</span><span>172</span> <span> * @return ContentDecorator the ContentDecorator widget instance 部件實(shí)例
</span><span>173</span> <span> * @see ContentDecorator
</span><span>174</span> <span>*/</span>
<span>175</span> <span>public</span> function beginContent($viewFile, $<span>params</span> =<span> [])
</span><span>176</span> <span> {
</span><span>177</span> <span>return</span><span> ContentDecorator::begin([
</span><span>178</span> <span>'</span><span>viewFile</span><span>'</span> =><span> $viewFile,
</span><span>179</span> <span>'</span><span>params</span><span>'</span> => $<span>params</span><span>,
</span><span>180</span> <span>'</span><span>view</span><span>'</span> => $<span>this</span><span>,
</span><span>181</span> <span> ]);
</span><span>182</span> <span> }
</span><span>183</span>
<span>184</span> <span>/*</span><span>*
</span><span>185</span> <span> * Ends the rendering of content.結(jié)束渲染內(nèi)容
</span><span>186</span> <span>*/</span>
<span>187</span> <span>public</span><span> function endContent()
</span><span>188</span> <span> {
</span><span>189</span> <span> ContentDecorator::end();
</span><span>190</span> <span> }
</span><span>191</span>
<span>192</span> <span>/*</span><span>*
</span><span>193</span> <span> * Begins fragment caching. 開始片段緩存
</span><span>194</span> <span> * This method will display cached content if it is available.
</span><span>195</span> <span> * If not, it will start caching and would expect an [[endCache()]]
</span><span>196</span> <span> * call to end the cache and save the content into cache.
</span><span>197</span> <span> * 展示可用的緩存內(nèi)容，否則將開始緩存內(nèi)容直到出現(xiàn)[endCache()]方法
</span><span>198</span> <span> * A typical usage of fragment caching is as follows,
</span><span>199</span> <span> *
</span><span>200</span> <span> * ~~~
</span><span>201</span> <span> * if ($this->beginCache($id)) {
</span><span>202</span> <span> * // ...generate content here
</span><span>203</span> <span> * $this->endCache();
</span><span>204</span> <span> * }
</span><span>205</span> <span> * ~~~
</span><span>206</span> <span> *
</span><span>207</span> <span> * @param string $id a unique ID identifying the fragment to be cached.緩存片段的唯一標(biāo)識(shí)
</span><span>208</span> <span> * @param array $properties initial property values for [[FragmentCache]]初始屬性[FragmentCache]
</span><span>209</span> <span> * @return boolean whether you should generate the content for caching. 是否生成緩存的內(nèi)容。
</span><span>210</span> <span> * False if the cached version is available.
</span><span>211</span> <span>*/</span>
<span>212</span> <span>public</span> function beginCache($id, $properties =<span> [])
</span><span>213</span> <span> {
</span><span>214</span> $properties[<span>'</span><span>id</span><span>'</span>] = $id; <span>//</span><span>片段標(biāo)識(shí)</span>
<span>215</span> $properties[<span>'</span><span>view</span><span>'</span>] = $<span>this</span>; <span>//</span><span>調(diào)用初始化屬性</span>
<span>216</span> <span>/*</span><span> @var $cache FragmentCache </span><span>*/</span>
<span>217</span> $cache =<span> FragmentCache::begin($properties);
</span><span>218</span> <span>if</span> ($cache->getCachedContent() !== <span>false</span><span>) {
</span><span>219</span> $<span>this</span>->endCache();<span>//</span><span>從緩存中讀取到了緩存的內(nèi)容，則渲染內(nèi)容并返回 false，不再進(jìn)行緩存</span>
<span>220</span>
<span>221</span> <span>return</span> <span>false</span><span>;
</span><span>222</span> } <span>else</span><span> {
</span><span>223</span> <span>return</span> <span>true</span><span>;
</span><span>224</span> <span> }
</span><span>225</span> <span> }
</span><span>226</span>
<span>227</span> <span>/*</span><span>*
</span><span>228</span> <span> * Ends fragment caching. 結(jié)束片段緩存
</span><span>229</span> <span>*/</span>
<span>230</span> <span>public</span><span> function endCache()
</span><span>231</span> <span> {
</span><span>232</span> <span> FragmentCache::end();
</span><span>233</span> <span> }
</span><span>234</span>
<span>235</span> <span>/*</span><span>*
</span><span>236</span> <span> * Marks the beginning of a page.頁面開始標(biāo)記
</span><span>237</span> <span>*/</span>
<span>238</span> <span>public</span><span> function beginPage()
</span><span>239</span> <span> {
</span><span>240</span> ob_start(); <span>//</span><span>打開輸出緩沖</span>
<span>241</span> ob_implicit_flush(<span>false</span>);<span>//</span><span>關(guān)閉緩沖區(qū)</span>
<span>242</span>
<span>243</span> $<span>this</span>-><span>trigger(self::EVENT_BEGIN_PAGE);
</span><span>244</span> <span> }
</span><span>245</span>
<span>246</span> <span>/*</span><span>*
</span><span>247</span> <span> * Marks the ending of a page. 頁面結(jié)束標(biāo)記
</span><span>248</span> <span>*/</span>
<span>249</span> <span>public</span><span> function endPage()
</span><span>250</span> <span> {
</span><span>251</span> $<span>this</span>-><span>trigger(self::EVENT_END_PAGE);
</span><span>252</span> ob_end_flush();<span>//</span><span>關(guān)閉輸出緩沖區(qū)</span>
<span>253</span> }
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How to delete Xiaohongshu notes
Mar 21, 2024 pm 08:12 PM
How to delete Xiaohongshu notes? Notes can be edited in the Xiaohongshu APP. Most users don’t know how to delete Xiaohongshu notes. Next, the editor brings users pictures and texts on how to delete Xiaohongshu notes. Tutorial, interested users come and take a look! Xiaohongshu usage tutorial How to delete Xiaohongshu notes 1. First open the Xiaohongshu APP and enter the main page, select [Me] in the lower right corner to enter the special area; 2. Then in the My area, click on the note page shown in the picture below , select the note you want to delete; 3. Enter the note page, click [three dots] in the upper right corner; 4. Finally, the function bar will expand at the bottom, click [Delete] to complete.
What should I do if the notes I posted on Xiaohongshu are missing? What's the reason why the notes it just sent can't be found?
Mar 21, 2024 pm 09:30 PM
As a Xiaohongshu user, we have all encountered the situation where published notes suddenly disappeared, which is undoubtedly confusing and worrying. In this case, what should we do? This article will focus on the topic of "What to do if the notes published by Xiaohongshu are missing" and give you a detailed answer. 1. What should I do if the notes published by Xiaohongshu are missing? First, don't panic. If you find that your notes are missing, staying calm is key and don't panic. This may be caused by platform system failure or operational errors. Checking release records is easy. Just open the Xiaohongshu App and click "Me" → "Publish" → "All Publications" to view your own publishing records. Here you can easily find previously published notes. 3.Repost. If found
GE universal remote codes program on any device
Mar 02, 2024 pm 01:58 PM
If you need to program any device remotely, this article will help you. We will share the top GE universal remote codes for programming any device. What is a GE remote control? GEUniversalRemote is a remote control that can be used to control multiple devices such as smart TVs, LG, Vizio, Sony, Blu-ray, DVD, DVR, Roku, AppleTV, streaming media players and more. GEUniversal remote controls come in various models with different features and functions. GEUniversalRemote can control up to four devices. Top Universal Remote Codes to Program on Any Device GE remotes come with a set of codes that allow them to work with different devices. you may
How to use Copilot to generate code
Mar 23, 2024 am 10:41 AM
As a programmer, I get excited about tools that simplify the coding experience. With the help of artificial intelligence tools, we can generate demo code and make necessary modifications as per the requirement. The newly introduced Copilot tool in Visual Studio Code allows us to create AI-generated code with natural language chat interactions. By explaining functionality, we can better understand the meaning of existing code. How to use Copilot to generate code? To get started, we first need to get the latest PowerPlatformTools extension. To achieve this, you need to go to the extension page, search for "PowerPlatformTool" and click the Install button
How to add product links in notes in Xiaohongshu Tutorial on adding product links in notes in Xiaohongshu
Mar 12, 2024 am 10:40 AM
How to add product links in notes in Xiaohongshu? In the Xiaohongshu app, users can not only browse various contents but also shop, so there is a lot of content about shopping recommendations and good product sharing in this app. If If you are an expert on this app, you can also share some shopping experiences, find merchants for cooperation, add links in notes, etc. Many people are willing to use this app for shopping, because it is not only convenient, but also has many Experts will make some recommendations. You can browse interesting content and see if there are any clothing products that suit you. Let’s take a look at how to add product links to notes! How to add product links to Xiaohongshu Notes Open the app on the desktop of your mobile phone. Click on the app homepage
Revealing the appeal of C language: Uncovering the potential of programmers
Feb 24, 2024 pm 11:21 PM
The Charm of Learning C Language: Unlocking the Potential of Programmers With the continuous development of technology, computer programming has become a field that has attracted much attention. Among many programming languages, C language has always been loved by programmers. Its simplicity, efficiency and wide application make learning C language the first step for many people to enter the field of programming. This article will discuss the charm of learning C language and how to unlock the potential of programmers by learning C language. First of all, the charm of learning C language lies in its simplicity. Compared with other programming languages, C language
Let's learn how to input the root number in Word together
Mar 19, 2024 pm 08:52 PM
When editing text content in Word, you sometimes need to enter formula symbols. Some guys don’t know how to input the root number in Word, so Xiaomian asked me to share with my friends a tutorial on how to input the root number in Word. Hope it helps my friends. First, open the Word software on your computer, then open the file you want to edit, and move the cursor to the location where you need to insert the root sign, refer to the picture example below. 2. Select [Insert], and then select [Formula] in the symbol. As shown in the red circle in the picture below: 3. Then select [Insert New Formula] below. As shown in the red circle in the picture below: 4. Select [Radical Formula], and then select the appropriate root sign. As shown in the red circle in the picture below:
How to display the source code of PHP code in the browser without being interpreted and executed?
Mar 11, 2024 am 10:54 AM
How to display the source code of PHP code in the browser without being interpreted and executed? PHP is a server-side scripting language commonly used to develop dynamic web pages. When a PHP file is requested on the server, the server interprets and executes the PHP code in it and sends the final HTML content to the browser for display. However, sometimes we want to display the source code of the PHP file directly in the browser instead of being executed. This article will introduce how to display the source code of PHP code in the browser without being interpreted and executed. In PHP, you can use
