用C开发PHP扩张初探
Jun 13, 2016 pm 01:26 PM
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int
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php
用C开发PHP扩展初探
学习PHP快2年了,对于PHP的有些东西还没有弄透,今天趁着周末学习了一下如何用C语言开发PHP扩展
函数功能:php里面的整数是有符号数,其内部实现其实就是long,不是unsigned long。对于32位机器来说,php最大能表示的整数就是2^31-1了,一般在应用中碰到大于2^31-1而小于2^32的数就只能用字符串来表示了。对于mixed int_ext(string in)来说,如果字符串in表示的整数小于2^31-1,那么就返回整数,如果大于就返回字符串。
开发扩展步骤如下:(首先需要下载php的源码,这里下载的是php-5.3.14)
1,建立扩展骨架
2,修改编译参数
去掉 PHP_ARG_ENABLE(int_ext, whether to enable int_ext support 和[ --enable-int_ext Enable int_ext support]) 两行前面的dnl 修改后为:
3,编写C代码
核心代码:
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