Php functies
- echo()
- print()
- var_dump()
- isset()
- empty()
- strlen()
- strtoupper()
- strtolower()
- strpos()
- str_replace()
- substr()
- explode()
- implode()
- array_push()
- array_pop()
- array_shift()
- array_unshift()
- array_merge()
- array_slice()
- array_keys()
- array_values()
- array_key_exists()
- in_array()
- count()
- sort()
- rsort()
- asort()
- ksort()
- shuffle()
- json_encode()
- json_decode()
- date()
- time()
- strtotime()
- round()
- floor()
- ceil()
- abs()
- min()
- max()
- rand()
- mt_rand()
- number_format()
- htmlspecialchars()
- htmlentities()
- strip_tags()
- trim()
- ltrim()
- rtrim()
- md5()
- sha1()
- password_hash()
- password_verify()
- filter_var()
- parse_url()
- basename()
- dirname()
- include
- require
- include_once
- require_once
- file_get_contents()
- file_put_contents()
- fopen()
- fread()
- fwrite()
- fclose()
- unlink()
- is_file()
- is_dir()
- mkdir()
- rmdir()
- scandir()
- session_start()
- session_destroy()
- session_unset()
- setcookie()
- header()
- die()
- exit()
- sleep()
- usleep()
- gettype()
- settype()
- is_array()