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Example Analysis of the Life cycle of PHP Custom extension

2025-04-02 Update From: SLTechnology News&Howtos shulou NAV: SLTechnology News&Howtos > Development >

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这篇文章将为大家详细讲解有关PHP自定义扩展之生命周期的示例分析,小编觉得挺实用的,因此分享给大家做个参考,希望大家阅读完这篇文章后可以有所收获。

php_request_startup

这个阶段和php_module_startup差不多,都是初始化工作,比php_module_startup简单很多,可以自己看下,重点来看下执行阶段

php_execute_script

用gdb看看调用栈,gdb ./php

在php_execute_script打断点,执行,在看下调用栈,

b php_execute_script(gdb) r test.phpbt#0 php_execute_script (primary_file=0x7fffffffe240) at /www/test/php/php-7.4.3/main/main.c:2541#1 0x00000000008bbd85 in do_cli (argc=2, argv=0x1425af0) at /www/test/php/php-7.4.3/sapi/cli/php_cli.c:961#2 0x00000000008bcd2d in main (argc=2, argv=0x1425af0) at /www/test/php/php-7.4.3/sapi/cli/php_cli.c:1356

在调用栈可以清楚看到执行流程,现在到/cli/php_cli.c文件看看做了哪些事情,

int c; zend_file_handle file_handle; int behavior = PHP_MODE_STANDARD; char *reflection_what = NULL; volatile int request_started = 0; volatile int exit_status = 0; char *php_optarg = NULL, *orig_optarg = NULL; int php_optind = 1, orig_optind = 1; char *exec_direct=NULL, *exec_run=NULL, *exec_begin=NULL, *exec_end=NULL; char *arg_free=NULL, **arg_excp=&arg_free; char *script_file=NULL, *translated_path = NULL; int interactive=0; int lineno = 0; const char *param_error=NULL; int hide_argv = 0; zend_try { CG(in_compilation) = 0; /* not initialized but needed for several options */ while ((c = php_getopt(argc, argv, OPTIONS, &php_optarg, &php_optind, 0, 2)) != -1) { switch (c) {

初始化变量,解析命令到/main/main.c文件看看真正的执行阶段

PHPAPI int php_execute_script(zend_file_handle *primary_file){ zend_file_handle *prepend_file_p, *append_file_p; zend_file_handle prepend_file = {{0}, NULL, NULL, 0, 0}, append_file = {{0}, NULL, NULL, 0, 0};#if HAVE_BROKEN_GETCWD volatile int old_cwd_fd = -1;#else char *old_cwd; ALLOCA_FLAG(use_heap)#endif int retval = 0;

加载要执行的php文件,通过zend_compile_file进行词法分析 语法分析,生成AST,编译成op_array,也就是指令集,

我们看下指令集,

b zend_executecbt(gdb) p *op_array$1 = {type = 2 '\002', arg_flags = "\000\000", fn_flags = 37748736, function_name = 0x0, scope = 0x0, prototype = 0x0, num_args = 0, required_num_args = 0, arg_info = 0x0, cache_size = 16, last_var = 2, T = 4, last = 13, opcodes = 0x7ffff5e8b000, run_time_cache__ptr = 0x0, static_variables_ptr__ptr = 0x7ffff5e78358, static_variables = 0x0, vars = 0x7ffff5e790f0, refcount = 0x7ffff5e85000, last_live_range = 0, last_try_catch = 0, live_range = 0x0, try_catch_array = 0x0, filename = 0x7ffff5e583c0, line_start = 1, line_end = 12, doc_comment = 0x0, last_literal = 5, literals = 0x7ffff5e8b1a0, reserved = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0}}

然后放到zend虚拟机上执行zend_execute(op_array, retval);这这里可以看到真正执行的是这个zend_execute_ex(execute_data);,它是一个函数指针,我们可以更换它,知道这个,那么我们在写扩展时可以重新写个zend_execute_ex函数替换php默认的,我们自己的就可以做很多事情,像拦截php函数,做性能监控。

请求关闭阶段php_request_shutdown,模块关闭阶段php_module_shutdown这两个阶段主要是做变量销毁,现在我们知道了一个自定义扩展在生命周期里的怎么执行的。

关于"PHP自定义扩展之生命周期的示例分析"这篇文章就分享到这里了,希望以上内容可以对大家有一定的帮助,使各位可以学到更多知识,如果觉得文章不错,请把它分享出去让更多的人看到。

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