Check string in php

- Check string contains in php
- Check string in array php
- Check string length in php
- Check empty string in php
- Check string exist in php
- Check if string in php
- Check string like in php
- Check string in text php
- Check string value in php
- Check string in url php
- Check null string in php
- Check query string in php
- Check string type in php
- Check character in string php
- Check string contains word in php