Find unused PHP functions

find-unused-functions.php

#!/usr/local/bin/php
<?php
function get_funcs( $dir ) {
	if ( is_dir( $dir ) ) {
		$files = scandir( $dir );
		$funcs = array();
		foreach ( $files as $file ) {
			if ( substr( $file, 0, 1 ) !== '.' ) {
				$funcs = array_merge( $funcs, get_funcs( $dir . "/" . $file ) );
			}
		}
		return $funcs;
	} else if( stristr( $dir, '.php' ) ) {
	    // Assuming php file. Lets get functions !
		$text = file_get_contents( $dir );
		preg_match_all( '#\s*?function\s+([a-zA-Z0-9_]+)\s*?\(#is', $text, $res );
		return $res[1];
    }
    return array();
}
$funcs = array_unique( get_funcs( getcwd() ) );
$blacklist = array(
    'log',
    'document',
    'input',
    'callback',
    '__construct',
    'initialize',
    'json_encode',
    'output',
    'process',
    'init',
    'add',
    'serve',
);

foreach ($funcs as $name ) {
    $out = array();
    if( in_array( $name, $blacklist ) ) {
        continue;
    }
    //echo "$name:";
    try {
		exec( "ag --ignore box '[\s=>:]$name\s*?\(' /Users/artpi/GIT/sandbox", $out, $ret );
	} catch ( Exception $e ) {
        continue;
    }
    //echo "[".count($out)."] ";
	if( count( $out ) < 5 ) {
        $used = array_filter( $out, function( $el ) {
			return ! stristr( $el, 'function' );
        } );
        if( count( $used ) === 0 ) {
			//echo "unused";
            echo $name. "\n";
        }
	}
	//echo "\n";
}

?>