- print_r: documentation ( source)
- preg_match_all: documentation ( source)
<?php
$body = "something
class ...
";
echo chr(92);
$namespaces = array();
preg_match_all('/(use\s+[a-z0-9_\\\]+;\n?)/mi', $body, $namespaces);
//echo preg_replace('/(use\s+[a-z0-9_\\\]+;\n*)/mi', '', $body);
print_r($namespaces);