wp_mkdir_p( string $target ): bool

2043function wp_mkdir_p( $target ) {2044	$wrapper = null;2045 2046	// Strip the protocol.2047	if ( wp_is_stream( $target ) ) {2048		list( $wrapper, $target ) = explode( '://', $target, 2 );2049	}2050 2051	// From php.net/mkdir user contributed notes.2052	$target = str_replace( '//', '/', $target );2053 2054	// Put the wrapper back on the target.2055	if ( null !== $wrapper ) {2056		$target = $wrapper . '://' . $target;2057	}2058 2059	/*2060	 * Safe mode fails with a trailing slash under certain PHP versions.2061	 * Use rtrim() instead of untrailingslashit to avoid formatting.php dependency.2062	 */2063	$target = rtrim( $target, '/' );2064	if ( empty( $target ) ) {2065		$target = '/';2066	}2067 2068	if ( file_exists( $target ) ) {2069		return @is_dir( $target );2070	}2071 2072	// Do not allow path traversals.2073	if ( str_contains( $target, '../' ) || str_contains( $target, '..' . DIRECTORY_SEPARATOR ) ) {2074		return false;2075	}2076 2077	// We need to find the permissions of the parent folder that exists and inherit that.2078	$target_parent = dirname( $target );2079	while ( '.' !== $target_parent && ! is_dir( $target_parent ) && dirname( $target_parent ) !== $target_parent ) {2080		$target_parent = dirname( $target_parent );2081	}2082 2083	// Get the permission bits.2084	$stat = @stat( $target_parent );2085	if ( $stat ) {2086		$dir_perms = $stat['mode'] & 0007777;2087	} else {2088		$dir_perms = 0777;2089	}2090 2091	if ( @mkdir( $target, $dir_perms, true ) ) {2092 2093		/*2094		 * If a umask is set that modifies $dir_perms, we'll have to re-set2095		 * the $dir_perms correctly with chmod()2096		 */2097		if ( ( $dir_perms & ~umask() ) !== $dir_perms ) {2098			$folder_parts = explode( '/', substr( $target, strlen( $target_parent ) + 1 ) );2099			for ( $i = 1, $c = count( $folder_parts ); $i <= $c; $i++ ) {2100				chmod( $target_parent . '/' . implode( '/', array_slice( $folder_parts, 0, $i ) ), $dir_perms );2101			}2102		}2103 2104		return true;2105	}2106 2107	return false;2108}