ENT_COMPAT
ENT_QUOTES
ENT_NOQUOTES
chr($ascii)
echo($arg1, ...)
explode($delimiter, $string, $limit?)
html_entity_decode($string, $quote_style=ENT_COMPAT, $charset=)
htmlentities($string, $quote_style=ENT_COMPAT, $charset=, $double_encode=true)
htmlentities($string, $quote_style=ENT_COMPAT, $charset=, $double_encode=true)
htmlspecialchars_decode ($string, $quote_style=ENT_COMPAT)
htmlspecialchars($string, $quote_style=ENT_COMPAT, $charset=,$double_encode=true)
implode($glue, $pieces)
ltrim($string, $charlist=)
ord($string)
rtrim($string, $charlist=)
stripos($haystack, $needle, $offset=0)
strlen($string)
strpos($haystack, $needle, $offset=0)
strtolower($string)
strtoupper($string)
substr($string, $start, $length=)
trim($string, $charlist=)

SORT_REGULAR
SORT_NUMERIC
SORT_STRING
array_filter($array, $callback=)
array_pop(&$array)
array_push(&$array, $var, ...)
array_shift(&$array)
array_unshift(&$array, $var, ...)
ksort(&$array, $sort_flags=SORT_REGULAR) 
krsort(&$array, $sort_flags=SORT_REGULAR) 
rsort(&$array, $sort_flags=SORT_REGULAR) 
sort(&$array, $sort_flags=SORT_REGULAR) 
usort(&$array, $cmp_function)

preg_match_all($pattern, $subject, &$matches, $flags=PREG_PATTERN_ORDER|PREG_SET_ORDER, $offset)
preg_match($pattern, $subject, &$matches=, $flags=0, $offset=0)
preg_replace($pattern, $replacement, $subject, $limit=-1, &$count)
preg_split($pattern, $subject, $limit=-1, $flags=0)

json_encode($value, $options=0)