get_defined_functions

(PHP 4 >= 4.0.4, PHP 5, PHP 7, PHP 8)

get_defined_functionsReturns an array of all defined functions

Description

get_defined_functions(bool $exclude_disabled = true): array

Gets an array of all defined functions.

Parameters

exclude_disabled

Whether disabled functions should be excluded from the return value.

Return Values

Returns a 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).

Changelog

Version Description
8.0.0 The default value of the exclude_disabled parameter has been changed from false to true.
7.0.15, 7.1.1 The exclude_disabled parameter has been added.

Examples

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);
?>

The above example will output something similar to:

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
        )

)

See Also

add a note

User Contributed Notes 11 notes

up
14
kkuczok at gmail dot com
11 years ago
You can list all arguments using ReflectionFunction class. It's not necessary to parse selected files/files as suggested by Nguyet.Duc.

http://php.net/manual/pl/class.reflectionfunction.php

Example:
<?php
function foo(&$bar, $big, $small = 1) {}
function
bar($foo) {}
function
noparams() {}
function
byrefandopt(&$the = 'one') {}

$functions = get_defined_functions();
$functions_list = array();
foreach (
$functions['user'] as $func) {
$f = new ReflectionFunction($func);
$args = array();
foreach (
$f->getParameters() as $param) {
$tmparg = '';
if (
$param->isPassedByReference()) $tmparg = '&';
if (
$param->isOptional()) {
$tmparg = '[' . $tmparg . '$' . $param->getName() . ' = ' . $param->getDefaultValue() . ']';
} else {
$tmparg.= '&' . $param->getName();
}
$args[] = $tmparg;
unset (
$tmparg);
}
$functions_list[] = 'function ' . $func . ' ( ' . implode(', ', $args) . ' )' . PHP_EOL;
}
print_r($functions_list);
?>

Output:
Array
(
[0] => function foo ( &&bar, &big, [$small = 1] )

[1] => function bar ( &foo )

[2] => function noparams ( )

[3] => function byrefandopt ( [&$the = one] )

)
up
9
mIHATESPAMduskis at bates dot edu
21 years ago
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.
up
6
peten at spam dot me dot not dot frontiernet dot net
22 years ago
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>
up
6
strrev xc.noxeh@ellij
16 years ago
Please note that functions created with create_function() are not returned.
(However that might change in a later version)
up
5
berchentreff at berchentreff dot de
18 years ago
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."'>".$bzeile."</a></li>";}
}
?>
</body>
</html>
up
2
spudinski at gmail dot com
16 years ago
To search for a function.
<html>
<head>
<title>List of all Internal functions</title>
<style type="text/css">
body {
background-color: #FFFFFF;
color: #222222;
font-size: 11px;
font-family: arial, tahoma;
}
table {
color: #222222;
font-size: 11px;
font-family: arial, tahoma;
}
tr.found {
background-color: #66EE00;
font-weight: bold;
}
a:link {
color: #222222;
}
a:visited {
color: #CCCCCC;
}
a:active {
color: #444444;
}
a:hover {
text-decoration: underline;
}
</style>
</head>
<body>
<p>
<form method="GET">
Search: <input type="text" name="search"><br>
<input type="submit">
</form>
</p>
<?php
if (!empty($_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>
up
1
Muneeb Aslam
9 years ago
This is rather a simple non-confusing script to get the function names linked to its manual page on php.net. Hope it helps someone. Commented script is self explainatory

<?php

/*declare a variable to php manual of functions.
change the $lng to the region you want it for,
i-e en/es/de etc etc */
$lng = "es";
$url = "http://www.php.net/manual/".$lng."/function.";

// get defined functions in a variable (it will be a 2D array)
$functions = get_defined_functions();

// Run nested foreach to get the function names
foreach($functions as $function){
foreach (
$function as $functionName){

/* Since php manual is using hyphens instead of underscores
for functions, we will convert underscores to hyphen whereever
there is one. */
if(strpos($functionName,"_") !== false){
$functionForURL = str_replace("_","-",$functionName);
} else {
$functionForURL = $functionName;
}

/* echo the link */
echo "<a href='".$url.$functionForURL.".php'>".$functionName."</a><br />";
}
}

?>
up
1
Muneeb Aslam
9 years ago
We can also get the function names with this simple foreach

<?php

//Since its a two dimensional array
$functions = get_defined_functions();

//We can use nested foreach to get the function names
foreach($functions as $function){
foreach(
$function as $thisFunc){
echo
$thisFunc . "<br />";
}
}

?>
up
2
Nguyet.Duc
13 years ago
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)
up
0
rob at webdimension dot co dot uk
13 years ago
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
?>
up
0
ChaosKaizer
16 years ago
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]) );
}
?>
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