Function list of php file

Question

How to get list of functions that are declared in a php file

Answer 1

To get list of defined and used functions in code, with small useful file manager, you can use code below. Enjoy!

if ((!function_exists('check_password'))||(!check_password()) ) exit('Access denied.'); //...security!

echo "";
if (!$f)    echo nl2br(htmlspecialchars('
    Useful parameters:
    $ext - allowed extensions, for example: ?ext=.php,css
    $extI - case-insensitivity, for example: ?extI=1&ext=.php,css
'));

if (($f)&&(is_readable($_SERVER['DOCUMENT_ROOT'].$f))&&(is_file($_SERVER['DOCUMENT_ROOT'].$f))) {

    echo "
File $f
\n";

    if(function_exists('get_used_functions_in_code')) {
        echo '
Used:
';
        $is=get_used_functions_in_code(file_get_contents($_SERVER['DOCUMENT_ROOT'].$f));
        sort($is);
        $def=get_defined_functions();
        $def['internal']=array_merge($def['internal'], array('__halt_compiler', 'abstract', 'and', 'array', 'as', 'break', 'callable', 'case', 'catch', 'class', 'clone', 'const', 'continue', 'declare', 'default', 'die', 'do', 'echo', 'else', 'elseif', 'empty', 'enddeclare', 'endfor', 'endforeach', 'endif', 'endswitch', 'endwhile', 'eval', 'exit', 'extends', 'final', 'finally', 'for', 'foreach', 'function', 'global', 'goto', 'if', 'implements', 'include', 'include_once', 'instanceof', 'insteadof', 'interface', 'isset', 'list', 'namespace', 'new', 'or', 'print', 'private', 'protected', 'public', 'require', 'require_once', 'return', 'static', 'switch', 'throw', 'trait', 'try', 'unset', 'use', 'var', 'while'));
        foreach ($def['user'] as &$e) $e=strtolower($e); unset($e);
        foreach ($is as &$e) if (!in_array(strtolower($e), $def['internal'], TRUE)) $e=''.$e.''; unset($e); //user-defined functions will be red
        echo implode('
'.PHP_EOL,$is);
    }
    else echo "Error: missing function 'get_used_functions_in_code' !";
    if(function_exists('get_defined_functions_in_code')) {
        echo '
Defined:
';
        $is=get_defined_functions_in_code(file_get_contents($_SERVER['DOCUMENT_ROOT'].$f));
        sort($is);
        echo implode('
',$is);
    }
    else echo "Error: missing function 'get_defined_functions_in_code' !";
}

/*
    File manager
*/
else {
    if (!function_exists('select_icon')) {
        function select_icon($name) {$name = pathinfo($name); return '['.$name["extension"].']';}
    }

    if($ext) $extensions=explode(',',strrev($ext));
    if(!$f) $f=dirname($_SERVER['PHP_SELF']);
    echo "
Dir ".htmlspecialchars($f)."

\n";
    $name=scandir($_SERVER['DOCUMENT_ROOT'].$f);

    foreach($name as $name) {
        if (!($fileOK=(!isset($extensions)))) {
            foreach($extensions as $is) if (!$fileOK) $fileOK=((strpos(strrev($name),$is)===0)||($extI &&(stripos(strrev($name),$is)===0)));
        }
        $is=is_dir($fullName=$_SERVER['DOCUMENT_ROOT']."$f/$name");
        if ($is || $fileOK) echo '';
        if ($is) echo '';
        elseif ($fileOK) echo '';
        if ($is || $fileOK) echo ''.PHP_EOL;
    }
    echo "\n
'.select_icon($is ? 'x.folder' : $name).' 
 '.($is ? '[' : '').''.htmlspecialchars($name).''.($is ? ']' : '').'
 
 
 '.number_format(filesize($fullName),0,"."," ").' 
 '.date ("Y.m.d (D) H:i",filemtime($fullName)).'
\n";
}

echo "

".date ("Y.m.d (D) H:i")."";
return;

/********************************************************************/


function get_used_functions_in_code($source) {
    $tokens = token_get_all($source);
    $functions = array();
    $thisStringIsFunc = 0;

    foreach($tokens as $token) {
        if(($token[0]!=T_WHITESPACE)&&((!is_string($token))||($token[0]!='('))) unset($func);
        if((is_array($token))&&(in_array($token[0],array(T_EVAL,T_EXIT,T_INCLUDE,T_INCLUDE_ONCE,T_LIST,T_REQUIRE,T_REQUIRE_ONCE,T_RETURN,T_UNSET)))) {$token[0]=T_STRING;$thisStringIsFunc=1;}
        switch($token[0]) {
            case T_FUNCTION: $thisStringIsFunc=-1;
            break;
            case T_STRING:
                if($thisStringIsFunc>0) {
                    if (!in_array(strtoupper($token[1]),$functionsUp)) {$functions[]=$token[1];$functionsUp[]=strtoupper($token[1]);}
                    $thisStringIsFunc = 0;
                } elseif ($thisStringIsFunc+1>0) {
                    $func = $token[1];
                } else $thisStringIsFunc = 0;

            break;
            case '(':if($func) if(!in_array(strtoupper($func),$functionsUp)) {$functions[]=$func;$functionsUp[]=strtoupper($func);}
        }
    }

    return $functions;
}

/********************************************/

function get_defined_functions_in_code($source) {
    $tokens = token_get_all($source);

        ... then Andrew code (get_defined_functions_in_file) (https://stackoverflow.com/a/2197870/9996503)
}