public function testStr()
{
$original = 'Hello world!';
$chars = 'o,e';
// you can list all chars
$charsForPattern = str_ireplace(',', '', $chars);
$result = processStr($original);
$this->assertInternalType('string', $result);
$this->assertNotRegExp('/[' . $charsForPattern . ']/i', $result);
$this->assertNotEquals($result, $original);
if (strlen($result) == strlen($original)) {
$this->assertEquals($result[0], substr($original, -1));
} else {
$this->assertLessThan(strlen($original), strlen($result));
}
}
<?php
/**
* Created by PhpStorm.
* User: al
* Date: 17.11.15
* Time: 14:36
*/
$str = 'Hello world!';
function processStr($str)
{
$str = strrev($str);
$chars = explode(',', 'o,e');
// all chars
$str = str_ireplace($chars, '', $str);
return $str;
}
echo processStr($str);