Function handling 函数
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get_defined_functions

(PHP 4 >= 4.0.4, PHP 5)

get_defined_functions — Returns an array of all defined functions

说明

array get_defined_functions ( void )

Gets an array of all defined functions.

返回值

Returns an multidimensional array containing a list of all defined functions, both built-in (internal) and user-defined. The internal functions will be accessible via $arr["internal"], and the user defined ones using $arr["user"] (see example below).

范例

Example #1 get_defined_functions() example

<?php
function myrow($id, $data)
{
    return "<tr><th>$id</th><td>$data</td></tr>\n";
}

$arr = get_defined_functions();

print_r($arr);
?>

以上例程的输出类似于：

Array
(
    [internal] => Array
        (
            [0] => zend_version
            [1] => func_num_args
            [2] => func_get_arg
            [3] => func_get_args
            [4] => strlen
            [5] => strcmp
            [6] => strncmp
            ...
            [750] => bcscale
            [751] => bccomp
        )

    [user] => Array
        (
            [0] => myrow
        )

)

参见

Function handling 函数
在线手册：中文 英文
PHP手册
PHP手册 - N: Returns an array of all defined functions

用户评论:

Nguyet.Duc (30-Jul-2011 09:22)

get_defined_functions() just returns a list of function names without function arguments. Here is the code to list user-defined function names plus arguments:

<?php
    $content = file_get_contents('example.php');
    preg_match_all("/(function )(\S*\(\S*\))/", $content, $matches);
    foreach($matches[2] as $match) {
        $function[] = "// " . trim($match) . "<br />\n";
    }
    natcasesort($function);
    $functionlist .= "/* Functions in this file */<br />\n";
    $functionlist .= "/**************************/<br />\n\n";
    $functionlist .= implode('', $function);
    echo $functionlist;
?>

Output:

/* Functions in this file */
/**************************/
// add_data($data)
// add_files($list)
// archive($name)
// bzip_file($name)

rob at webdimension dot co dot uk (01-Apr-2011 04:48)

A quick way of using this function:

<?php
// ALL USER DEFINED FUNCTIONS
$arr = get_defined_functions();
foreach ($arr['user'] as $key => $value){
echo $value.'<br />';
}
// ALL USER DEFINED FUNCTIONS

// ALL INTERNAL FUNCTIONS
$arr = get_defined_functions();
foreach ($arr['internal'] as $key => $value){
echo $value.'<br />';
}
// ALL INTERNAL FUNCTIONS
?>

gmdebby at gmail dot com (14-Jan-2011 09:28)

Note : get_defined_functions return lowercase names on Windows 7 with WampServer 2.1

ChaosKaizer (10-Jul-2008 03:13)

for user defined function

<?php
/**
 * @param string $function_name The user function name, as a string.
 * @return Returns TRUE if function_name  exists and is a function, FALSE otherwise.
 */
function user_func_exists($function_name = 'do_action') {
  
    $func = get_defined_functions();
  
    $user_func = array_flip($func['user']);
  
    unset($func);
  
    return ( isset($user_func[$function_name]) );  
}
?>

strrev xc.noxeh@ellij (04-Jun-2008 01:31)

Please note that functions created with create_function() are not returned.
(However that might change in a later version)

spudinski at gmail dot com (01-Apr-2008 02:13)

To search for a function.
<html>
<head>
<title>List of all Internal functions</title>
<style type="text/css">
body {
    background-color: #FFFFFF;
    color: #222222;
    font-size: 11px;
    font-family: arial, tahoma;
}
table {
    color: #222222;
    font-size: 11px;
    font-family: arial, tahoma;
}
tr.found {
    background-color: #66EE00;
    font-weight: bold;
}
a:link {
    color: #222222;
}
a:visited {
    color: #CCCCCC;
}
a:active {
    color: #444444;
}
a:hover {
    text-decoration: underline;
}
</style>
</head>
<body>
<p>
    <form method="GET">
    Search: <input type="text" name="search"><br>
    <input type="submit">
    </form>
</p>
<?php
    if (!empty($_GET['search'])) {
        echo '<p>' . '<a href="#' . $_GET['search'] . '">' .
        'Goto ' . $_GET['search'] . '</a>' .
        '<script type="text/javascript">
            window.onload = function() {
                document.location += "#' . $_GET['search'] . '";
                return true;
            }
        </script>
        </p>';
    }
?>
<p>
    <table>
<?php
    $country = 'us';
    $functions = get_defined_functions();
    $functions = $functions['internal'];
    $num = 0;
    foreach($functions as $function) {
        $num++;
        echo '<tr ' . (($_GET['search'] == $function) ? 'class="found"' : '') . '><td>' .
        number_format($num) . '</td><td>' . '<a name="' . $function . '" href="http://' . $country . '.php.net/' .
        $function . '">' . $function . '</a>' . '</td></tr>';
    }
?>
    </table>
</p>
</body>
</html>

berchentreff at berchentreff dot de (31-Mar-2006 01:46)

look at here, list all the defined function on your php-Version and give as well formatted output width links onto the php-manual:

<html><head>
<style type="text/css"><!--
li{font-family:Verdana,Arail,sans-serif;width:500px;margin-top:7px;}
a{padding:4px;}
a.a1{font-size:12px;background-color:#CCCCCC;color:#663300;}
a.a1:hover{background-color:#663300;color:#CCCCCC;}
a.a1:visited{background-color:#fff;color:#999;}
a.a1:visited:hover{background-color:#fff;color:#999;}
a.a0{font-size:12px;background-color:#CCCCFF;color:#663399;}
a.a0:hover{background-color:#663399;color:#CCCCFF;}
a.a0:visited{background-color:#ffC;color:#999;}
a.a0:visited:hover{background-color:#ffC;color:#999;}
--></style>
</head><body style="background-color:#999;">
<?php
$arr = get_defined_functions();

foreach($arr as $zeile){
sort($zeile);$s=0;
foreach($zeile as $bzeile){
$s=($s)?0:1;
echo "<li><a class='a".$s."'  href='http://de.php.net/".$bzeile."'>".$bzeile."</a></li>";}
}
?>
</body>
</html>

kaneccc at seznam dot cz (28-Mar-2003 12:30)

I've written simple XML-RPC server which automatically registers all defined functions starting with "RPC_" prefix and found, that with PHP 2.4.3 on Win32 and Linux platforms function names are in lowercase so the xmlrpc_server_call_method() is case sensitive which is correct with XML, but not with PHP and get_functions_defined()

I also suggest changing the function to have flags/options to return internal, user or both functions only and starting with prefix such as:

<?php
// constants
define( 'xxx_INTERNAL', 0x1 );
define( 'xxx_USER', 0x2 );
define( 'xxx_BOTH', 0x3 );

// declaration
array get_functions_defined( int options, string prefix );
?>

with both arguments optional.

Johnnie

mIHATESPAMduskis at bates dot edu (21-Nov-2002 10:47)

At least with PHP 4.2.3 on a GNU/Linux/Apache platform, get_defined_functions() returns user-defined functions as all-lower case strings regardless of how the functions are capitalized when they are defined.

Threw me for a loop.

peten at spam dot me dot not dot frontiernet dot net (02-Jun-2002 06:28)

Here's a useful trick with the get_defined_functions function - show all available functions with a link to the documentation (you can even change the mirror it goes to):

<?php
  // the php mirror
  $php_host = "http://us2.php.net/";

  // the number of cols in our table
  $num_cols = 3;

  $ar = get_defined_functions();
  $int_funct = $ar[internal];
  sort($int_funct);
  $count = count($int_funct);
?>
<html>
 <head>
  <title>
   Available PHP Functions
  </title>
 </head>
 <body>
  <p>
   <?php print $count; ?> functions    
    available on
    <?php
      print $_SERVER[SERVER_NAME];
     ?>
   (<a href="<?php print $php_host;?>"
    target="phpwin">php</a>
    version
    <?php print phpversion(); ?>)
  </p>
  <table align="center" border="2">
   <tr> 
<?php
  for($i=0;$i<$count;$i++) {
    $doc = $php_host
     . "manual/en/function."
     . strtr($int_funct[$i], "_", "-")
     . ".php";
    print "    <td><a href=\"" . $doc
     . "\" target=\"phpwin\">"
     . $int_funct[$i]
     . "</a></td>\n";
    if(($i > 1)
     && (($i+$num_cols)%$num_cols==($num_cols-1)))  
      print "   </tr>\n   <tr>\n";
    }
  for($i=($num_cols-($count%$num_cols));$i>0;$i--) 
    print "    <td>&nbsp;</td>\n";
?>
  </table>
 </body>
</html>