empty; `null` otherwise. */ function array_key_first( array $array ) { // phpcs:ignore Universal.NamingConventions.NoReservedKeywordParameterNames.arrayFound foreach ( $array as $key => $value ) { return $key; } } } if ( ! function_exists( 'array_key_last' ) ) { /** * Polyfill for `array_key_last()` function added in PHP 7.3. * * Get the last key of the given array without affecting the * internal array pointer. * * @since 5.9.0 * * @param array $array An array. * @return string|int|null The last key of array if the array *. is not empty; `null` otherwise. */ function array_key_last( array $array ) { // phpcs:ignore Universal.NamingConventions.NoReservedKeywordParameterNames.arrayFound if ( empty( $array ) ) { return null; } end( $array ); return key( $array ); } } if ( ! function_exists( 'str_contains' ) ) { /** * Polyfill for `str_contains()` function added in PHP 8.0. * * Performs a case-sensitive check indicating if needle is * contained in haystack. * * @since 5.9.0 * * @param string $haystack The string to search in. * @param string $needle The substring to search for in the `$haystack`. * @return bool True if `$needle` is in `$haystack`, otherwise false. */ function str_contains( $haystack, $needle ) { if ( '' === $needle ) { return true; } return false !== strpos( $haystack, $needle ); } } if ( ! function_exists( 'str_starts_with' ) ) { /** * Polyfill for `str_starts_with()` function added in PHP 8.0. * * Performs a case-sensitive check indicating if * the haystack begins with needle. * * @since 5.9.0 * * @param string $haystack The string to search in. * @param string $needle The substring to search for in the `$haystack`. * @return bool True if `$haystack` starts with `$needle`, otherwise false. */ function str_starts_with( $haystack, $needle ) { if ( '' === $needle ) { return true; } return 0 === strpos( $haystack, $needle ); } } if ( ! function_exists( 'str_ends_with' ) ) { /** * Polyfill for `str_ends_with()` function added in PHP 8.0. * * Performs a case-sensitive check indicating if * the haystack ends with needle. * * @since 5.9.0 * * @param string $haystack The string to search in. * @param string $needle The substring to search for in the `$haystack`. * @return bool True if `$haystack` ends with `$needle`, otherwise false. */ function str_ends_with( $haystack, $needle ) { if ( '' === $haystack ) { return '' === $needle; } $len = strlen( $needle ); return substr( $haystack, -$len, $len ) === $needle; } } // IMAGETYPE_WEBP constant is only defined in PHP 7.1 or later. if ( ! defined( 'IMAGETYPE_WEBP' ) ) { define( 'IMAGETYPE_WEBP', 18 ); } // IMG_WEBP constant is only defined in PHP 7.0.10 or later. if ( ! defined( 'IMG_WEBP' ) ) { define( 'IMG_WEBP', IMAGETYPE_WEBP ); }