Check if php string contains

- Php check if string contains word
- Php check if string contains special characters
- Php check if string contains only numbers
- Php check if string contains numbers
- Php check if string contains specific characters
- Php check if string contains letters
- Php check if string contains any of array
- Php check if string contains space
- Php check if string contains alphabets
- Php check if string contains multiple words
- Php check if string contains html tags
- Php check if string contains substring case insensitive
- Php check if string contains words in array
- Php check if string contains url
- Php check if string contains only letters