how to make like in php code example

Example 1: php string contains

$mystring = 'abc';
$findme   = 'a';
$pos = strpos($mystring, $findme);

Example 2: how to remove words in contain integer php

$input = "H3llo This is a? #test e3ample of a sentence-word bl&h.";
echo preg_replace('/(?=[^ ]*[^A-Za-z \'-])([^ ]*)(?:\\s+|$)/', '', $input);

This is of a sentence-word