PHP+MySQL
Jun 06, 2016 pm 07:48 PMphp開發(fā)工具 ZendStudio-7.2.0 MySQL Server 5.0,MySql輔助工具Navicat 8 Lite for MySQL 今天(2010-7-6)開始研究下Php PHP語法: ? php ? html body ? php echo " Hello World " ; ? / body / html PHP 中的每個代碼行都必須以分號結(jié)束。分號是一種分隔
php開發(fā)工具 ZendStudio-7.2.0
MySQL Server 5.0,MySql輔助工具Navicat 8 Lite for MySQL
今天(2010-7-6)開始研究下Php
?PHP語法:
<p><span></span><span>php<br><br></span><span>?></span></p>
?
<p><span><span>html</span><span>></span><span><br></span><span><span>body</span><span>></span><span><br><br></span><span></span><span>php<br></span><span>echo</span><span>"</span><span>Hello World</span><span>"</span><span>;<br></span><span>?></span><span><br><br></span><span></span><span>body</span><span>></span><span><br></span><span></span><span>html</span><span>></span></span></span></p>
PHP 中的每個代碼行都必須以分號結(jié)束。分號是一種分隔符,用于把指令集區(qū)分開來。
有兩種通過 PHP 來輸出文本的基礎(chǔ)指令:echo 和 print。在上面的例子中,我們使用了 echo 語句來輸出文本 "Hello World"。
PHP 中的變量
變量用于存儲值,比如數(shù)字、文本字符串或數(shù)組。
一旦設(shè)置了某個變量,我們就可以在腳本中重復(fù)地使用它。
PHP 中的所有變量都是以 $ 符號開始的。
在 PHP 中設(shè)置變量的正確方法是:
$var_name = value;
PHP 的入門者往往會忘記在變量的前面的 $ 符號。如果那樣做的話,變量將是無效的。
讓我們試著創(chuàng)建一個存有字符串的變量,和一個存有數(shù)值的變量:
<?php $txt = "Hello World!";$number = 16;?>
PHP 是一門松散類型的語言(Loosely Typed Language)
在 PHP 中,不需要在設(shè)置變量之前聲明該變量。
在上面的例子中,您看到了,不必向 PHP 聲明該變量的數(shù)據(jù)類型。
根據(jù)變量被設(shè)置的方式,PHP 會自動地把變量轉(zhuǎn)換為正確的數(shù)據(jù)類型。
在強類型的編程語言中,您必須在使用前聲明變量的類型和名稱。
在 PHP 中,變量會在使用時被自動聲明。
并置運算符(Concatenation Operator)
<p><span>在 PHP 中,只有一個字符串運算符。<br><br>并置運算符 (</span><span>.</span><span>) 用于把兩個字符串值連接起來。<br><br>要把兩個變量連接在一起,請使用這個點運算符 (</span><span>.</span><span>) :<br><br></span><span></span><span>php<br></span><span>$txt1</span><span>=</span><span>"</span><span>Hello World</span><span>"</span><span>;<br></span><span>$txt2</span><span>=</span><span>"</span><span>1234</span><span>"</span><span>;<br></span><span>echo</span><span>$txt1</span><span>.</span><span>"</span><span>"</span><span>.</span><span>$txt2</span><span>;<br></span><span>?></span><span><br>以上代碼的輸出:<br><br>Hello World 1234您可以看到,我們在上面的例子中使用了兩次并置運算符。這是由于我們需要插入第三個字符串。<br><br>為了分隔這兩個變量,我們在 </span><span>$txt1</span><span> 與 </span><span>$txt2</span><span> 之間插入了一個空格。<br></span></p>
?
<p><span>strlen</span><span>() 函數(shù)用于計算字符串的長度。<br><br>讓我們算出字符串 </span><span>"</span><span>Hello world!</span><span>"</span><span> 的長度:<br><br></span><span></span><span>php<br></span><span>echo</span><span>strlen</span><span>(</span><span>"</span><span>Hello world!</span><span>"</span><span>);<br></span><span>?></span><span><br>以上代碼的輸出:<br><br>12字符串的長度信息常常用在循環(huán)或其他函數(shù)中,因為那時確定字符串何時結(jié)束是很重要的(例如,在循環(huán)中,我們需要在字符串中的最后一個字符之后結(jié)束循環(huán))。<br></span></p>
?
使用 strpos() 函數(shù)
<p><span>strpos</span><span>() 函數(shù)用于在字符串內(nèi)檢索一段字符串或一個字符。<br><br>如果在字符串中找到匹配,該函數(shù)會返回第一個匹配的位置。如果未找到匹配,則返回 </span><span>FALSE</span><span>。<br><br>讓我們試一下,是不是能在字符串中找到子字符串 </span><span>"</span><span>world</span><span>"</span><span>:<br><br></span><span></span><span>php<br></span><span>echo</span><span>strpos</span><span>(</span><span>"</span><span>Hello world!</span><span>"</span><span>,</span><span>"</span><span>world</span><span>"</span><span>);<br></span><span>?></span><span> <br>以上代碼的輸出是: <br><br>6正如您看到的,在我們的字符串中,字符串 </span><span>"</span><span>world</span><span>"</span><span> 的位置是 </span><span>6</span><span>。返回 </span><span>6</span><span> 而不是 </span><span>7</span><span>,是由于字符串中的首個位置的 </span><span>0</span><span>,而不是 </span><span>1</span><span>。<br></span></p>
?

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