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PHP extension development notes (1) Create array attributes of classes
PHP extension development notes (1) Create array attributes of classes
It is very easy to initialize a class, such as the code below
MYCLASS_PROTERTY_* This is related to the macro string of define
<code>zend_class_entry *myclass_ce;
zend_function_entry myclass_methods[] = {
PHP_FE_END
};
PHP_MINIT_FUNCTION(myext)
{
zend_class_entry ce;
INIT_CLASS_ENTRY(ce, <span>"MyClass"</span>, myclass_methods);
myclass_ce = zend_register_internal_class(&ce TSRMLS_CC);
zend_<span>declare</span>_class_constant_string(myclass_ce, ZEND_STRL(MYCLASS_PROTERTY_NAME_VERSION), PHP_SLIM_VERSION);
zend_<span>declare</span>_property_null(myclass_ce, ZEND_STRL(MYCLASS_PROTERTY_NAME_CONTAINER), ZEND_ACC_PUBLIC TSRMLS_CC);
zend_<span>declare</span>_property_null(myclass_ce, ZEND_STRL(MYCLASS_PROTERTY_NAME_APPS), ZEND_ACC_STATIC|ZEND_ACC_PROTECTED TSRMLS_CC);
zend_<span>declare</span>_property_null(myclass_ce, ZEND_STRL(MYCLASS_PROTERTY_NAME_NAME), ZEND_ACC_PROTECTED TSRMLS_CC);
zend_<span>declare</span>_property_null(myclass_ce, ZEND_STRL(MYCLASS_PROTERTY_NAME_ERROR), ZEND_ACC_PROTECTED TSRMLS_CC);
zend_<span>declare</span>_property_null(myclass_ce, ZEND_STRL(MYCLASS_PROTERTY_NAME_NOTFOUND), ZEND_ACC_PROTECTED TSRMLS_CC);
zend_<span>declare</span>_property_null(myclass_ce, ZEND_STRL(MYCLASS_PROTERTY_NAME_MIDDLEWARE), ZEND_ACC_PROTECTED TSRMLS_CC);
<span>return</span> SUCCESS;
}</code>The above codes are all simple properties.
When trying to initialize the attributes of an array for the class myclass, it failed. The code relative to PHP is as follows
<code><span><span>class</span><span>MyClass</span> {
public $myArray = array<span>()</span>;
}
/* 对应的<span>C</span>代码 */
zval *myArray;
<span>MAKE_STD_ZVAL</span><span>(<span>myArray</span>)</span>;
array_init<span>(<span>myArray</span>)</span>;
zend_declare_property<span>(<span>myclass_ce</span>, <span>ZEND_STRL(MYCLASS_PROTERTY_NAME_MYCLASS)</span>, <span>myArray</span>, <span>ZEND_ACC_PUBLIC</span><span>TSRMLS_CC</span>)</span>;</span></code>No problem was found when the above C code was mutated. When new MyClass() was executed, There is a problem, the error is as follows:
<code>Internal zval<span>'s</span> can<span>'t</span> be arrays, objects <span>or</span> resources</code>
Look at the source code of zend as follows:
<code><span>if</span> (ce-><span><span>type</span> & <span>ZEND_INTERNAL_CLASS</span>) <span>{
<span>switch</span>(<span>Z_TYPE_P(property)</span>) {
<span>case</span><span>IS_ARRAY</span>:
<span>case</span><span>IS_CONSTANT_ARRAY</span>:
<span>case</span><span>IS_OBJECT</span>:
<span>case</span><span>IS_RESOURCE</span>:
<span>zend_error</span>(<span>E_CORE_ERROR</span>, "<span>Internal</span><span>zval's</span><span>can't</span><span>be</span><span>arrays</span>, <span>objects</span><span>or</span><span>resources</span>");
<span>break</span>;
<span>default</span>:
<span>break</span>;
}</span></span>
}</code>When we call zend_register_internal_class, myclass_ce has been initialized to ZEND_INTERNAL_CLASS, and the myArray parameter of zend_declare_property at this time is of type IS_ARRAY. So this error occurred.
Why does such an error occur?
The result I got after searching is: http://grokbase.com/t/php/php-internals/07a4b14xvb/php-dev-how-declare-protected-array-property-at-internal-class-properly this It is the result of 2007. I am using the PHP5.4 version, and I still have this problem for the time being. The article also gives a method to implement array attributes in disguise, by implementing it in the constructor.
<code>PHP_METHOD(myclass, __construct) {
zval <span>*apps</span>, <span>*pThis</span>;
pThis = getThis();
MAKE_STD_ZVAL(apps);
array_init(apps);
add_property_zval_ex(pThis, ZEND_STRL(SLIM_SLIM_PROTERTY_NAME_APPS), apps);
}</code>The corresponding php code for this implementation
<code><span><span>class</span><span>MyClass</span> {</span><span><span>function</span><span>__construct</span><span>()</span> {</span><span>$this</span>->app = <span>array</span>();
}
}</code>The above introduces the PHP extension development notes (1) Array attributes of the created class, including aspects of the content. I hope it will be helpful to friends who are interested in PHP tutorials.
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