PHP Syntax check

.gitlab-ci.yml

image: ubuntu:12.04

before_script:
  - apt-get update
  - apt-get install -y php5-cli

test:
  script:
    - php syntax-check.php

syntax-check.php

<?php

$exit_code = 0;

$paths = array(
	'htdocs/wp-content/themes/my-custom-theme',,
	'htdocs/wp-content/plugins',
	'htdocs/wp-content/mu-plugins',
);

$files = array();
$lint_output = array();

foreach ( $paths as $path ) {
	$Directory = new RecursiveDirectoryIterator( $path );
	$Iterator = new RecursiveIteratorIterator( $Directory );
	$Regex = new RegexIterator($Iterator, '/^.+\.php$/i', RecursiveRegexIterator::GET_MATCH);
	foreach ( $Regex as $file ) {
		$files[] = $file[0];
	}
}

$i = 0;
foreach ( $files as $file ) {
	$return = 0;
	$output = array();
	exec("php -l {$file}", $lint_output, $return);
	if ( $return !== 0 ) {
		$exit_code   = 1;
	}
	++$i;
}

exit( $exit_code );