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extract() //½«Êý×éÖеļüÃû×÷Ϊ±äÁ¿Ãû,¼üÖµ×÷Ϊ±äÁ¿Öµ
Àý:
form.html
<form action="action.php" method="post">
<input type="text" name="username">
<input type="password" name="password">
<input type="submit">
 
action.php
<?php
$p_test=extract($_POST);
echo $p_test; //Êä³öµÄÊDZäÁ¿µÄ¸öÊý3
extract($_POST); //Ï൱ÓÚ$username=$_POST['username']; $password=$POST['password'];
echo "Óû§Ãû=".$username; //Êä³öÓû§Ãû=username
echo "ÃÜÂë=".$password; //Êä³öÃÜÂë=password
?>
 
<?php
/* ¼Ù¶¨ $var_array ÊÇ wddx_deserialize ·µ»ØµÄÊý×é*/
$size = "large";
$var_array = array("color" => "blue",
"size" => "medium",
"shape" => "sphere");
extract($var_array, EXTR_PREFIX_SAME, "wddx");
echo "$color, $size, $shape, $wddx_size\n";
?>
 
ÉÏÀý½«Êä³ö£º
blue, large, sphere, medium 
$size ûÓб»¸²¸Ç£¬ÒòΪָ¶¨ÁË EXTR_PREFIX_SAME£¬ÕâʹµÃ $wddx_size ±»½¨Á¢¡£Èç¹ûÖ¸¶¨ÁË EXTR_SKIP£¬Ôò $wddx_size Ò²²»»á±»½¨Á¢¡£EXTR_OVERWRITE ½«Ê¹ $size µÄֵΪ“medium”£¬EXTR_PREFIX_ALL ½«½¨Á¢Ð±äÁ¿ $wddx_color£¬$wddx_size ºÍ $wddx_shape¡£ 
±ØÐëʹÓùØÁªÊý×飬Êý×ÖË÷ÒýµÄÊý×齫²»»á²úÉú½á¹û£¬³ý·ÇÓÃÁË EXTR_PREFIX_ALL »òÕß EXTR_PREFIX_INVALID¡£ 
file_exists() //¼ì²éÎļþ»òĿ¼ÊÇ·ñ´æÔÚ
Àý:
<?php
$filename = 'c:\windows';
if (file_exists($filename)) {
echo $filename."´æÔÚ";
} else {
echo $filename."²»´æÔÚ";
}
?>
 
method_exists() //¼ì²éÀàµÄ·½·¨ÊÇ·ñ´æÔÚ
Àý:
<?php
$directory = new Directory('.');
var_dump(method_exists($directory,'read'));
?>
 
ÉÏÀý½«Êä³ö£º
bool(true) 
str_replace(Òª±»Ìæ»»µÄ×Ö·û´®,Ìæ»»ÓõÄ×Ö·û´®,²Ù×÷×Ö·û´®[,Ìæ»»´ÎÊý¡¾¿ÉÑ¡²ÎÊý¡¿]);
ÔÚ¶¼²»Ê¹ÓÃÊý×éʱ£¬¸Ãº¯ÊýÖ±½ÓʹÓÃnew_needleÌæ»»ËùÓеÄneedle²¢·µ»ØÌæ»»ºóµÄ×Ö·û´®¡£È磺str_replace("m&quo