函數處理相關函數：call_user_func_array?— Call a callback with an array of parameterscall_user_func?— Call the callback given by the first parametercreate_function?— Create an anonymous (lambda-style) functionforward_static_call_array?— Call a static method and pass the arguments as arrayforward_static_call?— Call a static methodfunc_get_arg?— Return an item from the argument listfunc_get_args?— Returns an array comprising a function’s argument listfunc_num_args?— Returns the number of arguments passed to the functionfunction_exists?— Return TRUE if the given function has been definedget_defined_functions?— Returns an array of all defined functionsregister_shutdown_function?— Register a function for execution on shutdownregister_tick_function?— Register a function for execution on each tickunregister_tick_function?— De-register a function for execution on each tick變量處理相關函數：boolval?— Get the boolean value of a variabledebug_zval_dump?— Dumps a string representation of an internal zend value to outputdoubleval?— floatval 的別名empty?— 檢查一個變量是否為空floatval?— 獲取變量的浮點值get_defined_vars?— 返回由所有已定義變量所組成的數組get_resource_type?— 返回資源（resource）類型gettype?— 獲取變量的類型import_request_variables?— 將 GET／POST／Cookie 變量導入到全局作用域中intval?— 獲取變量的整數值is_array?— 檢測變量是否是數組is_bool?— 檢測變量是否是布爾型is_callable?— 檢測參數是否為合法的可調用結構is_double?— is_float 的別名is_float?— 檢測變量是否是浮點型is_int?— 檢測變量是否是整數is_integer?— is_int 的別名is_long?— is_int 的別名is_null?— 檢測變量是否為 NULLis_numeric?— 檢測變量是否為數字或數字字符串is_object?— 檢測變量是否是一個對象is_real?— is_float 的別名is_resource?— 檢測變量是否為資源類型is_scalar?— 檢測變量是否是一個標量is_string?— 檢測變量是否是字符串isset?— 檢測變量是否設置print_r?— 打印關于變量的易于理解的信息。serialize?— 產生一個可存儲的值的表示settype?— 設置變量的類型strval?— 獲取變量的字符串值unserialize?— 從已存儲的表示中創建 PHP 的值unset?— 釋放給定的變量var_dump?— 打印變量的相關信息var_export?— 輸出或返回一個變量的字符串表示