You can lookup built-in functions by searching for e.g. PHPAPI(stream_copy_to_stream) and find the implementation in ext/standard/streamsfuncs.c. How to do that for a language construct like echo? I found it is associated with T_ECHO in Zend/zend_language_parser.y but couldn’t trace how it works from th…
Tag: php-internals
What was PHP’s “o” serialization format for?
The list of backwards-incompatible changes for PHP 7.4 contain the following note: Serialization The o serialization format has been removed. As it is never produced by PHP, this may only break unserialization of manually crafted strings. (Note that this is referring to a little-o, not the big-O format which …
Does mysqli_close() do anything other than just destroying the object?
I know that using mysqli_close() is not needed, because PHP will destruct the object when the script is finished. What I would like to know is why do we have such a function in the language in the …
What is the actual memory cost of storing an integer?
lets say I just do this So I store 10 integers in an array. If the integer is a 32b one, the memory cost should be 40 bytes. Problem is, I didn’t tell php that it is an integer so it either has to store it as something else? (js likes to make doubles for example) or keep extra data