توفِّر PHP عددًا من الدوال التي تستخدم لمعالجة السلاسل النصية.
addcslashes()addslashes()bin2hex()chop()chr()chunk_split()convert_uudecode()convert_uuencode()count_chars()crypt()echo()explode()fprintf()get-html_translation_table()hex2bin()htmlspecialchars()implode()lcfirst()levenshtein()ltrim()md5_file()md5()metaphone()nl2br()number_format()ord()parse_str()print()printf()rtrim()sha1_file()sha1()similar_text()soundex()sprintf()sscanf()str_getcsv()str_ireplace()str_pad()str_repeat()str_replace()str_rot13()str_shuffle()str_split()str_word_count()strcasecmp()strcmp()strcspn()strip_tags()stripcslashes()stripos()stripslashes()stristr()strlen()strnatcasecmp()strnatcmp()strncmp()strpbrk()strpos()strrchr()strrev()strripos()strrpos()strspn()strstr()strtok()strtolower()strtoupper()strtr()substr_compare()substr_count()substr_replace()substr()trim()ucfirst()ucwords()vfprintf()vprintf()vsprintf()wordwrap()