- ltrim: documentation ( source)
<?php
$dir = array();
$dir[] = '/dir/dva';
$dir[] = '//dir\dva';
$dir[] = '\dir\dva';
$dir[] = '\\\\dir\dva';
$dir[] = '\/dir\dva';
$dir[] = '/\dir\dva';
foreach ($dir as $value) {
echo ltrim($value, '/') . "<br>\n";
echo ltrim($value, '\\') . "<br>\n";
echo ltrim($value, '\/') . "<br>\n";
echo ltrim($value, '/\\') . "<br>\n";
}