常量的内部结构 Zend/zend_constants.h typedef struct _zend_constant {    zval value; /* zval结构，PHP内部变量的存储结构 */    int flags; /* 常量的标记如 CONST_PERSISTENT |...

PHP的缓存有很多种，包括输出缓冲(ob系列函数)，opcode缓存(APC，eAccelerator,XCache等扩展实现)，这些大家已经很熟悉了，接下来介绍一下一个不太被人注意的PHP缓存机制：realpath_cache。 ...

Did you know that inserting 2^16 = 65536 specially crafted values into a normal PHP array can take 30 seconds? Normally this would take only 0.01 seconds. This is the code to re...

struct _php_core_globals { zend_bool magic_quotes_gpc; // 是否对输入的GET/POST/Cookie数据使用自动字符串转义。 zend_bool magic_quotes_runtime; //是否对运行时从外...

sapi_module_struct.startup static int php_cli_startup(sapi_module_struct *sapi_module) /* {{{ */ { if (php_module_startup(sapi_module, NULL, 0)==FAILURE) { return F...

There has been lots of buzz about many of the new features in PHP 5.4, like the traits support, the short array syntax and all those other syntax improvements. But one set of ch...

通过对函数实现的原理分析和性能测试，我们总结出以下一些结论： PHP的函数调用开销相对较大。 函数相关信息保存在一个大的hash_table中，每次调用时通过函数名在hash表中查找，因此函数名长...

As of PHP 5.3 web developers can use a wonderful feature of the language, the __invoke() magic method. This enables PHP to provide the Closure class and based on it the ability ...

php版本 PHP 5.3.14 1. ==(调用is_equal_function->compare_function ),!=(调用is_not_equal_function->compare_function) <?php $i = 1; $j = 1.0; echo $i == $j; //opcode line # * ...

In this post I want to investigate the memory usage of PHP arrays (and values in general) using the following script as an example, which creates 100000 unique integer array ele...

2 . ===(调用is_identical_function)，!==(调用is_not_identical_function -> is_identical_function ) <?php $i = 1; $j = 1.0; echo $i === $j; //opcode line # * op ...

== is_equal_function -> compare_function != is_not_equal_function -> compare_function === is_identical_function !== is_not_identical_function -> is_identical_function >= ,<= is_...

#define PHP_FUNCTION ZEND_FUNCTION #define ZEND_FUNCTION(name) ZEND_NAMED_FUNCTION( ZEND_FN(name) ) #define ZEND_FN(name) zif_##name #define ZEND_NAMED_FUNCTION(name) void name(...

typedef struct _sapi_module_struct sapi_module_struct; struct _sapi_module_struct { char *name; char *pretty_name; int (*startup)(struct _sapi_module_struct *sapi_m...

count count是我们经常用到的一个函数，其功能是返回一个数组的长度。 count这个函数，其复杂度是多少呢？一种常见的说法是count函数会遍历整个数组然后求出元素个数，因此复杂度是O(n)。那实...

当在C中定义了一个结构类型时，它的大小是否等于各字段(field)大小之和？编译器将如何在内存中放置这些字段？ANSI C对结构体的内存布局有什么要求？而我们的程序又能否依赖这种布局？这些问题...

JSON is the modern data format used in "AJAX" applications. As the leading language for the Web PHP course has support for handling JSON data: You can pass any data to json_enco...