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<?php
function myFun(){
echo "hello,ÕÅÈý";
}
//ÀûÓÃfunction_exists·½·¨ÅжÏ×Ô¶¯ÒÔ·½·¨ÊÇ·ñ´æÔÚ
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//"myFun"»òmyFun
if(function_exists(myFun)){
echo "´æÔÚ";
}else{
echo "²»´æÔÚ";
}
?>
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form.html
<form action="action.php" method="post">
<input type="text" name="username">
<input type="password" name="password">
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<?PHP
//====================================================
// FileName: snap.class.php
//   ......
<?php
//ʹÓÃfunction¹Ø¼ü×Ö¶¨Òå·½·¨
function num($value,$value2 = 'ÄúºÃ£¡'){
echo $value.$value2;
}
//µÚÒ»´Îµ÷ÓÃ
num("ÕÅÈý");
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