Applies PHP's lint check to all PHP files in a directory.

lint-all-files-recursive.php

<?php

/**
 * Recurses each directory and runs PHP's lint function against each file
 * to test for parse errors.
 *
 * @param	string	$dir	the directory you would like to start from
 * @return 	array		the files that did not pass the test
 */
function lint( $dir = 'C:\dev\\' )
{
	static $failed = array();

	foreach ( new RecursiveDirectoryIterator($dir) as $path => $objSplFileInfo )
	{
		// recurse if dir
		if ( $objSplFileInfo->isDir() )
		{
			if ( stristr( $objSplFileInfo->getFileName(), '.svn' ) !== false )
			{
				continue;
			}

			lint( $objSplFileInfo->getPathName() );

			continue;
		}

		// are there any non-dirs that aren't files?
		if ( !$objSplFileInfo->isFile() )
		{
			throw new UnexpectedValueException( 'Not a dir and not a file?' );
		}

		// skip non-php files
		if ( preg_match( '#\.php$#', $objSplFileInfo->getFileName() ) !== 1 )
		{
			continue;
		}

		// perform the lint check
		$result = exec( 'php -l '. escapeshellarg($objSplFileInfo) );
		if ( preg_match( '#^No syntax errors detected in#', $result ) !== 1 )
		{
			$failed[ $objSplFileInfo->getPathName() ] = $result;
			echo $failed, ' = ', $result;
		}

	}

	return $failed;
}

?>

There is a more beautiful _parallel _one-liner

find . -name "*.php" -print0 | xargs -0 -n1 -P8 php -l

@igravity this is beautiful thank you

@igbanam note that xargs will stop executing on the first error. I use this instead:

find . -type f -name '*.php' -exec php -l {} \; |grep -v "No syntax errors detected"

You may want to invert the return code of grep so a CI build can fail, if grep found some errors:
find . -type f -name '*.php' -exec php -l {} \; | (! grep -v "No syntax errors detected" )