PHP扩展开发入门3>带参数的函数
原来笔记,就和撸代码一样,都很随性。后来看的代码和博客多了。发现太随性了,很难撸出高质量的代码,很难写出能看懂的笔记。
记笔记是一个梳理知识的过程,可以表达出自己对该知识的熟悉程度。
今天撸一段代码,记录一下PHP扩展中如何接收参数。
废话就不多说了,至于基础性的,比如如何创建扩展也不在这里说了,如何写接收参数的函数,只需要修改函数功能部分。昨天写的功能部分如下:
/* 这里是功能 这个函数不接收参数,只有返回值。 */ PHP_FUNCTION(helloworld){ int len; char *strg; len = spprintf(&strg, 0, "%.78s", "helloworld"); RETURN_STRINGL(strg, len, 0);}
这里实现接收参数计算a+b的值。首先接收参数的话需要在方法内添加如下代码
if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "ll", &a, &b) == FAILURE) { return; }
这里接收参数需要了解如下内容,这里接收一个整数型就需要写入一个'l',接收两个就写两个'll',以此类推,,然后在写入接收参数后赋值给指定的变量地址,一个参数就写一个变量,两个就写两个,三个就写三个一次类推。至于字符串和其他的参数,回来同一说明。
b Booleanl Integer 整型d Floating point 浮点型s String 字符串r Resource 资源a Array 数组o Object instance 对象O Object instance of a specified type 特定类型的对象z Non-specific zval 任意类型~Z zval**类型f 表示函数、方法名称,PHP5.1里貌似木有... .
修改后的代码如下
/* 这里是功能 这个函数不接收参数,只有返回值。 */ PHP_FUNCTION(helloworld){ int a; int b; if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "ll", &a, &b) == FAILURE) { return; } int c; c=a+b; RETURN_LONG(c);}
就这样,一个加法计算的函数就算完成了。接下来编译启动。然后在PHP代码中这样调用:
<?php echo helloworld(1,3);

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