PHP
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发表于 5年以前
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阅读量：8299
1.¼ÓÔØGD¿a
GD¿aÊÇÒ»¸o¿ªÅµÄ¶¯Ì¬´´½¨Í¼Ïñ¡¢Ô´´uÂe¹«¿ªµÄº¯Êý¿a£¬¿ÉÒÔ´Ó¹Ù½ÍøÕ¾http://www.boutell.com/gd´¦ÏÂÔØ¡£Ä¿Ç°£¬GD¿aÖ§³ÖGIF¡¢PNG¡¢JPEG¡¢WBMPºÍXBMµÈ¶aÖÖͼÏñ¸ñʽ£¬ÓÃÓÚ¶ÔͼÏñµÄ´¦Ài¡£
GD¿aÔÚPHP 5ÖÐÊÇĬÈÏ°²×°µÄ£¬µ«Òª¼¤»iGD¿a£¬±ØÐeÐÞ¸Äphp.iniÎļþ¡£½«¸ÃÎļþÖеġ°;extension=php_gd2.dll¡±Ñ¡ÏiÇ°µÄֺš°;¡±É¾³ý£¬±£´aeÐ޸ĺoµÄÎļþ²¢ÖØÐÂÆo¶¯ApacheþÎñÆ÷¼´¿ÉÉuЧ¡£
2.´´½¨Ò»¸o¼oµ¥µÄͼÏñ
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ʹÓÃimagecreate£¨£(C)º¯Êý´´½¨Ò»¸o¿i¶ÈΪ200ÏñËØ£¬¸ß¶ÈΪ60ÏñËصĻ²¼£¬²¢ÉeÖû²¼ÑÕÉ«RGB£¨225,66£¬159£(C)£¬×iºoÊa³oÒ»¸oGIF¸ñʽµÄͼÏñ£¬´uÂeÈçÏ£º
<?php
$im = imagecreate(200,60); //´´½¨Ò»¸o»²¼
$white = imagecolorallocate($im, 225,66,159); //ÉeÖû²¼µÄ±³¾°ÑÕɫΪdzÂÌÉ«
imagegif($im); //Êa³oͼÏñ
?>3.ʹÓÃGD2º¯ÊýÔÚÕÕƬÉÏÌi¼ÓÎÄ×Ö
PHPÖеÄGD¿aÖ§³ÖÖÐÎÄ£¬µ«±ØÐeÒªÒÔUTF-8¸ñʽµÄ²ÎÊýÀ´½øÐд«µÝ£¬Èç¹uʹÓÃimageString()º¯ÊýÖ±½Ó»aeÖÆÖÐÎÄ×Öu´®¾Í»aÏÔʾÂÒÂe£¬ÕaÊÇÒoΪGD2¶ÔÖÐÎÄÖ»ÄܽÓÊÕUTF-8±aÂe¸ñʽ£¬²¢ÇÒĬÈÏʹÓÃÓ¢ÎÄ×ÖÌa£¬ËuÒÔÒªÊa³oÖÐÎÄ×Öu´®£¬±ØÐe¶ÔÖÐÎÄ×Öu´®½øÐÐתÂe£¬²¢ÉeÖÃÖÐÎÄ×ÖuʹÓõÄ×ÖÌa¡£*ñÔo£¬Êa³oµÄÖ»ÄÜÊÇÂÒÂe¡£
ʹÓÃimageTTFText£¨£(C)º¯Êý½«ÎÄ×Ö¡°ÕaÊÇÒ»¸o²aÊÔ¡±Êa³oµ½Í¼ÏñÖУ¬´uÂeÈçÏ£º
<?php
header("content-type:image/jpeg"); //¶¨ÒaÊa³oΪͼÏñÀaÐÍ
$im=imagecreatefromjpeg("images/photo.jpg"); //ÔØÈeÕÕƬ
$textcolor=imagecolorallocate($im,56,73,136);//ÉeÖÃ×ÖÌaÑÕɫΪÀ¶É«£¬ÖµÎªRGBÑÕÉ«Öµ
$fnt="c:/windows/fonts/simhei.ttf"; //¶¨Òa×ÖÌa
$motto=iconv("gb2312","utf-8","ÕaÊÇÒ»¸o²aÊÔ"); //¶¨ÒaÊa³o×ÖÌa´®
imageTTFText($im,220,0,480,340,$textcolor,$fnt,$motto); //дTTFÎÄ×Öµ½Í¼ÖÐ
imagejpeg($im); //½¨Á¢JPEGͼÐÎ
imagedestroy($im); //½aÊøͼÐΣ¬ÊÍ*ÅÄÚ´ae¿Õ¼a
?>
4.PHPÉu³ÉÑeÖ¤Âe
´´½¨Ò»¸ochecks.phpÎļþÔÚÎļþÖÐʹÓÃGD2º¯Êý´´½¨Ò»¸o4λµÄÑeÖ¤Âe£¬²¢½«Éu³ÉµÄÑeÖ¤Âe±£´aeµ½sessionÖУº
<?php
session_start();
header("content-type:image/png"); //ÉeÖô´½¨Í¼ÏñµÄ¸ñʽ
$image_width=70; //ÉeÖÃͼÏñ¿i¶È
$image_height=18; //ÉeÖÃͼÏñ¸ß¶È
srand(microtime()*100000); //ÉeÖÃËae»uÊýµÄÖÖ×Ó
for($i=0;$i<4;$i++){ //Ñ»*Êa³oÒ»¸o4λµÄËae»uÊý
$new_number.=dechex(rand(0,15));
}
$_SESSION[check_checks]=$new_number; //½«»ñÈ¡µÄËae»uÊýÑeÖ¤ÂeдÈeµ½SESSION±aÁ¿ÖÐ
$num_image=imagecreate($image_width,$image_height); //´´½¨Ò»¸o»²¼
imagecolorallocate($num_image,255,255,255); //ÉeÖû²¼µÄÑÕÉ«
for($i=0;$i<strlen($_SESSION[check_checks]);$i++){ //Ñ»*¶ÁÈ¡SESSION±aÁ¿ÖеÄÑeÖ¤Âe
$font=mt_rand(3,5); //ÉeÖÃËae»uµÄ×ÖÌa
$x=mt_rand(1,8)+$image_width*$i/4; //ÉeÖÃËae»u×Ö*uËuÔÚλÖõÄX×ø±e
$y=mt_rand(1,$image_height/4); //ÉeÖÃËae»u×Ö*uËuÔÚλÖõÄY×ø±e
$color=imagecolorallocate($num_image,mt_rand(0,100),mt_rand(0,150),mt_rand(0,200)); //ÉeÖÃ×Ö*uµÄÑÕÉ«
imagestring($num_image,$font,$x,$y,$_SESSION[check_checks][$i],$color); //ˮƽÊa³o×Ö*u
}
imagepng($num_image); //Éu³ÉPNG¸ñʽµÄͼÏñ
imagedestroy($num_image); //ÊÍ*ÅͼÏñ×ÊÔ´
?>
´´½¨Ò»¸oÓû§µÇ¼µÄ±iµ¥²¢µ÷ÓÃchecks.phpÔÚ±iµ¥ÖÐÊa³oͼÏñµÄÄÚÈÝ£º
<?php
session_start();
if($_POST["Submit"]!=""){
$checks=$_POST["checks"];
if($checks==""){
echo "<script> alert('ÑeÖ¤Âe²»ÄÜΪ¿Õ');window.location.href='index.php';</script>";
}
if($checks==$_SESSION[check_checks]){
echo "<script> alert('Óû§µÇ¼³É¹¦!');window.location.href='index.php';</script>";
}else{
echo "<script> alert('ÄuÊaÈeµÄÑeÖ¤Âe²»ÕýÈ*!');window.location.href='index.php';</script>";
}
}
?>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>randº¯ÊýµÄÓ¦ÓÃ</title>
<style type="text/css">
<!--
.STYLE1 {
font-size: 12px;
color: #FFFFFF;
font-weight: bold;
}
.style2 {font-weight: bold; font-size: 12px;}
-->
</style>
</head>
<body>
<form name="form" method="post" action="">
<table width="1003" border="0" cellspacing="0" cellpadding="0">
<tr>
<td width="168" height="169" background="images/index_01.gif"> </td>
<td width="685" background="images/index_02.gif"> </td>
<td width="150" background="images/index_03.gif"> </td>
</tr>
<tr>
<td width="168" height="311" background="images/index_04.gif"> </td>
<td background="images/index_05.gif"><table width="675" height="169" border="0" cellpadding="0" cellspacing="0">
<tr>
<td height="43" align="center" valign="baseline"> </td>
<td align="center" valign="middle"> </td>
<td align="center" valign="baseline"> </td>
</tr>
<tr>
<td width="382" height="24" align="center" valign="baseline"> </td>
<td width="207" height="24" valign="middle"><span class="style2">Óû§Ãu</span><span class="STYLE1">
<input name="txt_user" id="txt_user" style="height:20px " size="10">
</span></td>
<td width="86" height="24" align="center" valign="baseline"> </td>
</tr>
<tr>
<td height="24" align="center" valign="baseline"> </td>
<td height="24" valign="middle"><span class="style2">ÃܤuÂe</span><span class="STYLE1">
<input name="txt_pwd" type="password" id="txt_pwd" style="FONT-SIZE: 9pt; height:20px" size="10">
</span></td>
<td height="24" align="center" valign="baseline"> </td>
</tr>
<tr>
<td height="24" align="center" valign="baseline"> </td>
<td height="24" valign="middle"><span class="style2">ÑeÖ¤Âe</span><span class="STYLE1">
<input name="checks" size="6" style="height:20px ">
<img src="checks.php" width="70" height="18" border="0" align="bottom"></span> </td>
<td height="24" align="center" valign="baseline"> </td>
</tr>
<tr>
<td height="40" align="center" valign="baseline"> </td>
<td align="center" valign="baseline"> <input type="submit" name="Submit" value="怬"></td>
<td align="center" valign="baseline"> </td>
</tr>
</table></td>
<td background="images/index_06.gif"> </td>
</tr>
<tr>
<td height="100"> </td>
<td> </td>
<td> </td>
</tr>
</table>
</form>
</body>
</html>ÒÔÉÏÄÚÈÝÊÇС±a¸ø´o¼Ò*ÖÏiµÄÓйØphpÖмoµ¥µÄͼÐδ¦Ài£¬Ï£Íu´o¼Òϲ»¶¡£