strings
- addslashes
- chop
- echo
- explode
- htmlspecialchars
- html_entity_decode
- implode
- lcfirst
- levenshtein
- md5
- md5_file
- nl2br
- number_format
- ord
- parse_str
- print
- printf
- quotemeta
- soundex
- sprintf
- strcasecmp
- strchr
- strcmp
- stripos
- stripslashes
- strip_tags
- stristr
- strnatcasecmp
- strnatcmp
- strncasecmp
- strncmp
- strpbrk
- strpos
- strrchr
- strrev
- strripos
- strrpos
- strstr
- strtolower
- strtoupper
- strtr
- str_ireplace
- str_pad
- str_repeat
- str_replace
- str_rot13
- str_shuffle
- str_split
- substr
- substr_compare
- substr_count
- substr_replace
- ucfirst
- ucwords
- wordwrap