php - substr_count and strtolower used together give inconsistent results -

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i trying use substr_count check occurrence of particular string. code seems giving inconsistent results.

sometimes echoes 1 , 0. wonder if can explain me why happening? thanks! 

$val = "hello world ansprüche theme park"; $ne = "ansprüche"; echo substr_count(strtolower($val),$ne);

in string latin charter "ansprüche". first have convert string iso-8859-1 characters encoded utf-8 single-byte iso-8859-1.

use below code. it's working fine.

<?php    $val = "hello world ansprüche theme park hello";    $ne = "ansprüche";    echo substr_count(strtolower(utf8_decode($val)), utf8_decode($ne)); ?>

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