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<?php
/** @return int|false */
function preg_match(string $pattern, string $subject, &$subpatterns = null, int $flags = 0, int $offset = 0) {}
/** @return int|false */
function preg_match_all(string $pattern, string $subject, &$subpatterns = null, int $flags = 0, int $offset = 0) {}
/**
* @param string|array $regex
* @param string|array $replace
* @param string|array $subject
* @return string|array|null
*/
function preg_replace($regex, $replace, $subject, int $limit = -1, &$count = null) {}
/**
* @param string|array $regex
* @param string|array $replace
* @param string|array $subject
* @return string|array|null
*/
function preg_filter($regex, $replace, $subject, int $limit = -1, &$count = null) {}
/**
* @param string|array $regex
* @param string|array $subject
* @return string|array|null
*
* TODO: $callback should be `callable`
*/
function preg_replace_callback($regex, $callback, $subject, int $limit = -1, &$count = null, int $flags = 0) {}
/**
* @param string|array $subject
* @return string|array|null
*/
function preg_replace_callback_array(array $pattern, $subject, int $limit = -1, &$count = null, int $flags = 0) {}
/**
* @return array|false
*/
function preg_split(string $pattern, string $subject, int $limit = -1, int $flags = 0) {}
function preg_quote(string $str, ?string $delim_char = null): string {}
/** @return array|false */
function preg_grep(string $regex, array $input, int $flags = 0) {}
function preg_last_error(): int {}
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