how to get substring?

[seahorse123]

I have file names like:
a11_001.htm
b34_02.htm
c8_003.htm

Now I want to get the substring before character '_', it will show as:
a11
b34
c8

how can I do that?

thanks for any help.

 

[sleipnir214]

I'd use the strpos() and substr() functions:

<?php
$a = 'a11_001.htm';
$position = strpos($a, '_');

if ($position !== FALSE)
{
	$b = substr ($a, 0, $position);
}
else
{
	$b = $a;
}

print $b;
?>

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[seahorse123]

thanks a lot.