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    <p>As far as I know, this is not what <code>ZEND_BEGIN_ARG_INFO_EX</code> is for.</p> <p><code>ZEND_BEGIN_ARG_INFO_EX</code> is a PHP 5 addition is used for producing cleaner code, enabling type hinting, pass-by-reference and reflection. Consider the following arginfo declarations for your actual function that just returns true:</p> <pre><code>ZEND_BEGIN_ARG_INFO_EX(arginfo_test, 0, 0, 3) ZEND_ARG_INFO(0, firstArg) ZEND_ARG_OBJ_INFO(0, objNonNull, stdClass, 0) ZEND_ARG_OBJ_INFO(0, obj, stdClass, 1) ZEND_ARG_OBJ_INFO(1, objByRef, stdClass, 1) ZEND_END_ARG_INFO() </code></pre> <p>It has the following effect:</p> <pre><code>sample_with_types(); // ok sample_with_types(1, null); // error: arg #2 should be stdClass sample_with_types(1, new stdClass, null); // ok sample_with_types(1, new stdClass, 1); // error: arg #3 should be stdClass sample_with_types(1, new stdClass, null, 2); // error: arg #4 must be reference </code></pre> <p>Additionally, it provides reflection capabilities to your function:</p> <pre><code>$ref = new ReflectionFunction('sample_with_types'); var_dump($ref-&gt;getParameters()); </code></pre> <p>...giving output similar to:</p> <pre><code>array(4) { [0]=&gt; &amp;object(ReflectionParameter)#2 (1) { ["name"]=&gt; string(8) "firstArg" } [1]=&gt; &amp;object(ReflectionParameter)#3 (1) { ["name"]=&gt; string(10) "objNonNull" } [2]=&gt; &amp;object(ReflectionParameter)#4 (1) { ["name"]=&gt; string(3) "obj" } [3]=&gt; &amp;object(ReflectionParameter)#5 (1) { ["name"]=&gt; string(8) "objByRef" } } </code></pre> <p>If you omit the arginfo, <code>ReflectionFunction::getParameters()</code> returns an empty array instead.</p> <p>The <code>required_num_args</code> macro parameter is used specifically for reflection, and denotes how many parameters will be marked required when reflecting the function.</p> <p>If you need to make the arguments required and not just mark them as required when using reflection, you still have to use <code>zend_parse_parameters</code>, which in most cases, you will still need to get the actual values of the arguments:</p> <pre><code>PHP_FUNCTION(sample_with_types) { long arg1; zval *arg2 = NULL, *arg3 = NULL, *arg4 = NULL; zend_class_entry ce2, ce3, ce4; if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "looo", &amp;arg1, &amp;arg2, &amp;ce2, &amp;arg3, &amp;ce3, &amp;arg4, &amp;ce4) == FAILURE) { return; } RETURN_TRUE; } </code></pre> <p>Note how I used <code>"looo"</code> (generic object types) and not <code>"lOO!O!"</code> (specific object types with null specifiers) in the above. The type hinting already has been specified with arginfo, so there's no need to do it twice.</p> <p>So, without arginfo:</p> <ul> <li>You'd have to use a handful of <code>zend_fetch_class</code> calls and class entries to type hint your object arguments.</li> <li>It wouldn't enable reflection.</li> <li>You wouldn't be able to declare arguments passed by reference.</li> <li>It would obviously produce less clean code.</li> </ul> <p>For obvious reasons, you'll want to make sure both your arginfo declaration and your <code>zend_parse_parameters</code> call matches.</p>
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    1. POHow to make ZEND_BEGIN_ARG_INFO_EX control number of arguments, passed to a PHP extension?
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    1. POHow to make ZEND_BEGIN_ARG_INFO_EX control number of arguments, passed to a PHP extension?
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    1. COThank you @netcoder for the info and efforts to clarify the purpose of that macro. It makes pretty much sense, and actually I had discovered that before asking the question. The main, thing, however, that caused my puzzlement and made me go to SO, was the `required_num_args` parameter. It seemed like auto-validation of args num, but in practice it does nothing. Could it be, that you know its purpose?
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      1. USAndrey Tserkus
    2. CO@AndreyTserkus: `required_num_args` is used for reflection and denotes when to stop counting parameters as required (i.e.: when calling `isOptional()`). It doesn't have any effect other than that. (I updated the answer with this information as well.)
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    3. COgreat, thank you!
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