Check if string php
- Check if php string contains
- Check if empty string php
- Check if string exists php
- Check if string includes php
- Check if string has php
- Check if string is php email
- Check if string starts with php
- Check if string is number php
- Check if string in array php
- Check if string is json php
- Check if string is date php
- Check if string has substring php
- Check if string is int php
- Check if url contains string php
- Check if variable is string php