php method to obtain verification code: [
The operating environment of this article: windows10 system, php 7, thinkpad t480 computer.
We often use the verification code function in our daily life, so if How should we implement a verification code function ourselves? Below we give the specific implementation code for your reference!
If you are a beginner, then I strongly recommend that you follow the code Comment step by step instead of copying the code directly.
Create a new captcha.php:
<?php
//11>設(shè)置session,必須處于腳本最頂部
session_start();
/*$image = imagecreatetruecolor(100, 30); //1>設(shè)置驗(yàn)證碼圖片大小的函數(shù)
//5>設(shè)置驗(yàn)證碼顏色 imagecolorallocate(int im, int red, int green, int blue);
$bgcolor = imagecolorallocate($image,255,255,255); //#ffffff
//6>區(qū)域填充 int imagefill(int im, int x, int y, int col) (x,y) 所在的區(qū)域著色,col 表示欲涂上的顏色
imagefill($image, 0, 0, $bgcolor);
//10>設(shè)置變量
$captcha_code = "";*/
//7>生成隨機(jī)數(shù)字
for($i=0;$i<4;$i++){
//設(shè)置字體大小
$fontsize = 6;
//設(shè)置字體顏色，隨機(jī)顏色
$fontcolor = imagecolorallocate($image, rand(0,120),rand(0,120), rand(0,120)); //0-120深顏色
//設(shè)置數(shù)字
$fontcontent = rand(0,9);
//10>.=連續(xù)定義變量
$captcha_code .= $fontcontent;
//設(shè)置坐標(biāo)
$x = ($i*100/4)+rand(5,10);
$y = rand(5,10);
imagestring($image,$fontsize,$x,$y,$fontcontent,$fontcolor);
}
//10>存到session
$_SESSION['authcode'] = $captcha_code;
//8>增加干擾元素，設(shè)置雪花點(diǎn)
for($i=0;$i<200;$i++){
//設(shè)置點(diǎn)的顏色，50-200顏色比數(shù)字淺，不干擾閱讀
$pointcolor = imagecolorallocate($image,rand(50,200), rand(50,200), rand(50,200));
//imagesetpixel — 畫一個單一像素
imagesetpixel($image, rand(1,99), rand(1,29), $pointcolor);
}
//9>增加干擾元素，設(shè)置橫線
for($i=0;$i<4;$i++){
//設(shè)置線的顏色
$linecolor = imagecolorallocate($image,rand(80,220), rand(80,220),rand(80,220));
//設(shè)置線，兩點(diǎn)一線
imageline($image,rand(1,99), rand(1,29),rand(1,99), rand(1,29),$linecolor);
}
//2>設(shè)置頭部，image/png
header('Content-Type: image/png');
//3>imagepng() 建立png圖形函數(shù)
imagepng($image);
//4>imagedestroy() 結(jié)束圖形函數(shù) 銷毀$image
imagedestroy($image);Then comes the code for the static page: index.html
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>無標(biāo)題文檔</title>
</head>
<body>
<form method="post" action="./form.php">
<p>驗(yàn)證碼: <img src="/static/imghw/default1.png" data-src="https://img.php.cn/upload/image/894/977/896/1632296083303197.png" class="lazy" id="captcha_img" border='1' src='./captcha.php?r=echo rand(); ? alt="How to obtain verification code in php" >' style="max-width:90%" />
<a href="javascript：void(0)" onclick="document.getElementById('captcha_img').src='./captcha.php?r='+Math.random()">換一個?</a>
</p>
<P>請輸入驗(yàn)證碼:<input type="text" name='authcode' value=''/></p>
<p><input type='submit' value='提交' style='padding:6px 5px;'/></p>
</form>
</body>
</html>From index .html, you can see that the submitted form is to form.php, so there is also a judgment form.php code:
<?php
header("Content-Type:text/html;charset=utf-8"); //設(shè)置頭部信息
//isset()檢測變量是否設(shè)置
if(isset($_REQUEST['authcode'])){
session_start();
//strtolower()小寫函數(shù)
if(strtolower($_REQUEST['authcode'])== $_SESSION['authcode']){
//跳轉(zhuǎn)頁面
echo "<script language=\"javascript\">";
echo "document.location=\"./form.php\"";
echo "</script>";
}else{
//提示以及跳轉(zhuǎn)頁面
echo "<script language=\"javascript\">";
echo "alert('輸入錯誤!');";
echo "document.location=\"./form.php\"";
echo "</script>";
}
exit();
}The displayed page is as follows:
To add numbers and English verification code, you only need to change 7》 in the captcha.php page. The other two pages do not need to be touched. The code is as follows:
<?php
//11>設(shè)置session,必須處于腳本最頂部
session_start();
$image = imagecreatetruecolor(100, 30); //1>設(shè)置驗(yàn)證碼圖片大小的函數(shù)
//5>設(shè)置驗(yàn)證碼顏色 imagecolorallocate(int im, int red, int green, int blue);
$bgcolor = imagecolorallocate($image,255,255,255); //#ffffff
//6>區(qū)域填充 int imagefill(int im, int x, int y, int col) (x,y) 所在的區(qū)域著色,col 表示欲涂上的顏色
imagefill($image, 0, 0, $bgcolor);
//10>設(shè)置變量
$captcha_code = "";
//7>生成隨機(jī)的字母和數(shù)字
for($i=0;$i<4;$i++){
//設(shè)置字體大小
$fontsize = 8;
//設(shè)置字體顏色，隨機(jī)顏色
$fontcolor = imagecolorallocate($image, rand(0,120),rand(0,120), rand(0,120)); //0-120深顏色
//設(shè)置需要隨機(jī)取的值,去掉容易出錯的值如0和o
$data ='abcdefghigkmnpqrstuvwxy3456789';
//取出值，字符串截取方法 strlen獲取字符串長度
$fontcontent = substr($data, rand(0,strlen($data)),1);
//10>.=連續(xù)定義變量
$captcha_code .= $fontcontent;
//設(shè)置坐標(biāo)
$x = ($i*100/4)+rand(5,10);
$y = rand(5,10);
imagestring($image,$fontsize,$x,$y,$fontcontent,$fontcolor);
}
//10>存到session
$_SESSION['authcode'] = $captcha_code;
//8>增加干擾元素，設(shè)置雪花點(diǎn)
for($i=0;$i<200;$i++){
//設(shè)置點(diǎn)的顏色，50-200顏色比數(shù)字淺，不干擾閱讀
$pointcolor = imagecolorallocate($image,rand(50,200), rand(50,200), rand(50,200));
//imagesetpixel — 畫一個單一像素
imagesetpixel($image, rand(1,99), rand(1,29), $pointcolor);
}
//9>增加干擾元素，設(shè)置橫線
for($i=0;$i<4;$i++){
//設(shè)置線的顏色
$linecolor = imagecolorallocate($image,rand(80,220), rand(80,220),rand(80,220));
//設(shè)置線，兩點(diǎn)一線
imageline($image,rand(1,99), rand(1,29),rand(1,99), rand(1,29),$linecolor);
}
//2>設(shè)置頭部，image/png
header('Content-Type: image/png');
//3>imagepng() 建立png圖形函數(shù)
imagepng($image);
//4>imagedestroy() 結(jié)束圖形函數(shù) 銷毀$image
imagedestroy($image);The displayed page is as follows:
Generate Chinese character verification code. During the operation, a garbled error message is displayed, which cannot be displayed and cannot be resolved. The code is as follows:
php
//11>設(shè)置session,必須處于腳本最頂部
session_start();
//1>設(shè)置驗(yàn)證碼圖片大小的函數(shù)
$image = imagecreatetruecolor(200, 60);
//5>設(shè)置驗(yàn)證碼顏色 imagecolorallocate(int im, int red, int green, int blue);
$bgcolor = imagecolorallocate($image,255,255,255); //#ffffff
//6>區(qū)域填充 int imagefill(int im, int x, int y, int col) (x,y) 所在的區(qū)域著色,col 表示欲涂上的顏色
imagefill($image, 0, 0, $bgcolor);
//7>設(shè)置ttf字體
$fontface = 'FZYTK.TTF';
//7>設(shè)置字庫，實(shí)現(xiàn)簡單的數(shù)字儲備
$str='天地不仁以萬物為芻狗圣人不仁以百姓為芻狗這句經(jīng)常出現(xiàn)在控訴暴君暴政上地殘暴不仁把萬物都當(dāng)成低賤的豬狗來看待而那些高高在上的所謂圣人們也沒兩樣還不是把我們老百姓也當(dāng)成豬狗不如的東西但實(shí)在正取的解讀是地不情感用事對萬物一視同仁圣人不情感用事對百姓一視同仁執(zhí)子之手與子偕老當(dāng)男女主人公含情脈脈看著對方說了句執(zhí)子之手與子偕老女方淚眼朦朧含羞地回一句討厭啦這樣的情節(jié)我們是不是見過很多但是我們來看看這句的原句死生契闊與子成說執(zhí)子之手與子偕老于嗟闊兮不我活兮于嗟洵兮不我信兮意思是說戰(zhàn)士之間的約定說要一起死現(xiàn)在和我約定的人都走了我怎么活啊赤裸裸的兄弟江湖戰(zhàn)友友誼啊形容好基友的基情比男女之間的愛情要合適很多吧';
//str_split()切割字符串為一個數(shù)組,一個中文在utf_8為3個字符
$strdb = str_split($str,3);
//>11
$captcha_code = '';
//8>生成隨機(jī)的漢子
for($i=0;$i<4;$i++){
//設(shè)置字體顏色，隨機(jī)顏色
$fontcolor = imagecolorallocate($image, rand(0,120),rand(0,120), rand(0,120)); //0-120深顏色
//隨機(jī)選取中文
$in = rand(0,count($strdb));
$cn = $strdb[$in];
//將中文記錄到將保存到session的字符串中
$captcha_code .= $cn;
/*imagettftext (resource $image ,float $size ,float $angle ,int $x ,int $y,int $color,
string $fontfile ,string $text ) 幕布 ，尺寸，角度，坐標(biāo)，顏色，字體路徑，文本字符串
mt_rand()生成更好的隨機(jī)數(shù),比rand()快四倍*/
imagettftext($image, mt_rand(20,24),mt_rand(-60,60),(40*$i+20),mt_rand(30,35),$fontcolor,$fontface,$cn);
}
//11>存到session
$_SESSION['authcode'] = $captcha_code;
//9>增加干擾元素，設(shè)置點(diǎn)
for($i=0;$i<200;$i++){
//設(shè)置點(diǎn)的顏色，50-200顏色比數(shù)字淺，不干擾閱讀
$pointcolor = imagecolorallocate($image,rand(50,200), rand(50,200), rand(50,200));
//imagesetpixel — 畫一個單一像素
imagesetpixel($image, rand(1,199), rand(1,59), $pointcolor);
}
//10>增加干擾元素，設(shè)置線
for($i=0;$i<4;$i++){
//設(shè)置線的顏色
$linecolor = imagecolorallocate($image,rand(80,220), rand(80,220),rand(80,220));
//設(shè)置線，兩點(diǎn)一線
imageline($image,rand(1,199), rand(1,59),rand(1,199), rand(1,59),$linecolor);
}
//2>設(shè)置頭部，image/png
header('Content-Type: image/png');
//3>imagepng() 建立png圖形函數(shù)
imagepng($image);
//4>imagedestroy() 結(jié)束圖形函數(shù) 銷毀$image
imagedestroy($image); Recommended learning: php training
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