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PHPÉú³ÉËæ»ú×Ö·û´®µÄ·½·¨

Code:
<?php
function genRandomString($len)
{
$chars = array(
"a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", 
"l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", 
"w", "x", "y", "z", "A", "B", "C", "D", "E", "F", "G", 
"H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", 
"S", "T", "U", "V", "W", "X", "Y", "Z", "0", "1", "2", 
"3", "4", "5", "6", "7", "8", "9"
);
$charsLen = count($chars) - 1;
shuffle($chars);    // ½«Êý×é´òÂÒ
$output = "";
for ($i=0; $i<$len; $i++)
{
$output .= $chars[mt_rand(0, $charsLen)];
}
return $output;
}
$str = genRandomString(4); //ÊäÈëÒªÊäÈëµÄËæ»úÊýµÄ¸öÊý£»
$str .= "<br />";
$str .= genRandomString(4);
$str .= "<br />";
$str .= genRandomString(4);
echo $str;
?>


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¹úÍâPHP¿ªÔ´½¨ ......

PHP ¶ÁÈ¡µØÖ·À¸ ²ÎÊý


1.  $_GET
£º
http://localhost/a.php?a=ok  
   
  <?  
  echo  
$_GET['a'];   //ÏÔʾ"ok"  
  ?>
2.  $_SERVER['QUERY_STRING']
http://localhost/a.php?a=1&b=2&c=3  
   
  ......

PHP ÖÐ×Ô¶¨Ò庯ÊýµÄ¼¸ÖÖ·½Ê½


PHPÖÐͨ³£Óм¸ÖÖ×Ô¶¨Ò庯ÊýµÄ·½·¨£¬ÏÂÃæ½éÉÜһϣ¬ÎÒÃÇʹÓõÄÊÇÕâÖÖ·½Ê½£º
<?php
function foo($arg)
{
return $arg
}
?>
µ±Ä³Ð©²ÎÊýΪ¿ÉÑ¡ÊÇ£¬¿ÉÒÔÕâÑù¶¨Ò壺
<?php
function foo($arg = NULL)
{
return $arg == NULL ? "" : $arg;
}
?>
µ±ÎÒÃDz»ÏÞÖÆ²ÎÊý¸öÊýµÄʱºò£¬Ò²¿ÉÒ ......

php±í¸ñ(test)

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
    <head>
        <style type = "text/css">
        &nbs ......

PHPÑéÖ¤ÂëÉú³É½Å±¾£¨5λÊý×Öpng¸ñʽ£©


<?php
header("Content-Type:image/png");
srand((double)microtime()*1000000);
$img_height=20;
$img_width=60;
$im=@imagecreate($img_width,$img_height) or die("²»Äܳõʼ»¯GDÎļþÁ÷");
$background_color=imagecolorallocate($im,255,255,255);
$text_color=imagecolorallocate($im,233,14,91);
......
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