/maintenance/eval.php

<?php
/**
 * PHP lacks an interactive mode, but this can be very helpful when debugging.
 * This script lets a command-line user start up the wiki engine and then poke
 * about by issuing PHP commands directly.
 *
 * Unlike eg Python, you need to use a 'return' statement explicitly for the
 * interactive shell to print out the value of the expression. Multiple lines
 * are evaluated separately, so blocks need to be input without a line break.
 * Fatal errors such as use of undeclared functions can kill the shell.
 *
 * To get decent line editing behavior, you should compile PHP with support
 * for GNU readline (pass --with-readline to configure).
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 * http://www.gnu.org/copyleft/gpl.html
 *
 * @file
 * @ingroup Maintenance
 */

$optionsWithArgs = array( 'd' );

/** */
require_once( __DIR__ . "/commandLine.inc" );

if ( isset( $options['d'] ) ) {
	$d = $options['d'];
	if ( $d > 0 ) {
		$wgDebugLogFile = '/dev/stdout';
	}
	if ( $d > 1 ) {
		$lb = wfGetLB();
		$serverCount = $lb->getServerCount(); 
		for ( $i = 0; $i < $serverCount; $i++ ) {
			$server = $lb->getServerInfo( $i );
			$server['flags'] |= DBO_DEBUG;
			$lb->setServerInfo( $i, $server );
		}
	}
	if ( $d > 2 ) {
		$wgDebugFunctionEntry = true;
	}
}

$useReadline = function_exists( 'readline_add_history' )
			&& Maintenance::posix_isatty( 0 /*STDIN*/ );

if ( $useReadline ) {
	$historyFile = isset( $_ENV['HOME'] ) ?
		"{$_ENV['HOME']}/.mweval_history" : "$IP/maintenance/.mweval_history";
	readline_read_history( $historyFile );
}

while ( ( $line = Maintenance::readconsole() ) !== false ) {
	if ( $useReadline ) {
		readline_add_history( $line );
		readline_write_history( $historyFile );
	}
	$val = eval( $line . ";" );
	if ( wfIsHipHop() || is_null( $val ) ) {
		echo "\n";
	} elseif ( is_string( $val ) || is_numeric( $val ) ) {
		echo "$val\n";
	} else {
		var_dump( $val );
	}
}

print "\n";