The highest voted answer link is broken and doesn’t give that much explanation. PHP is written in C and the underlying structure is just a C array. C arrays are just chunks of memory. The indexes in C arrays must be continuous, you can’t have an index 0 and an index 1000 that comes after … Read more
This has been reported as Bug #49382 in PHP. In PHP 5.3, internal functionality was added to allow print_r() to show details of the underlying timestamp value held by an instance of DateTime, to assist with debugging. A side effect of this change is that when the object is dumped to text, these phantom public … Read more
Searching through my bookmarks, only links I found are those : Extension Writing Part I: Introduction to PHP and Zend Extension Writing Part II: Parameters, Arrays, and ZVALs Extension Writing Part II: Parameters, Arrays, and ZVALs [continued] Extension Writing Part III: Resources Wrapping C++ Classes in a PHP Extension If you are really interested by … Read more
That number is Z_OBJ_HANDLE_PP(struc) where struc is a zval which leads to Z_OBJVAL(zval).handle which leads to (zval).value.obj. See as well http://php.net/manual/en/internals2.variables.intro.php In short I would say it’s the object identifier written in decimal form (ref): php_printf(“%sobject(%s)#%d (%d) {\n”, COMMON, class_name, Z_OBJ_HANDLE_PP(struc), myht ? zend_hash_num_elements(myht) : 0); And not the count of objects ever created.
After much trial and error, I found that if I increase the output_buffering value in the php.ini file, this error goes away
The compiler code suggests that this is by design, though I don’t know what the official reasoning behind that is. I’m also not sure how much effort it would take to reliably implement this functionality, but there are definitely some limitations in the way that things are currently done. Though my knowledge of the PHP … Read more
Full working example: function EqualReferences(&$first, &$second){ if($first !== $second){ return false; } $value_of_first = $first; $first = ($first === true) ? false : true; // modify $first $is_ref = ($first === $second); // after modifying $first, $second will not be equal to $first, unless $second and $first points to the same variable. $first = $value_of_first; … Read more
This behavior could be classified as bug, so you should definitely not rely on it. The (simplified) conditions for the message not to be thrown on a function call are as follows (see the definition of the opcode ZEND_SEND_VAR_NO_REF): the argument is not a function call (or if it is, it returns by reference), and … Read more
foreach supports iteration over three different kinds of values: Arrays Normal objects Traversable objects In the following, I will try to explain precisely how iteration works in different cases. By far the simplest case is Traversable objects, as for these foreach is essentially only syntax sugar for code along these lines: foreach ($it as $k … Read more