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<title>Predefined Constants</title>
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<h1>Predefined Constants</h1>
<p class="simpara">
The constants below are defined by this extension, and
will only be available when the extension has either
been compiled into PHP or dynamically loaded at runtime.
</p>
<p class="para">
The following opcodes are defined as constants by uopz:
</p>
<p class="para">
<dl>
<dt id="constant.zend-exit">
<strong><code>ZEND_EXIT</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</dt>
<dd>
<span class="simpara">
Invoked by exit() and die(), recieves no arguments. Return boolean <strong><code>TRUE</code></strong> to exit, <strong><code>FALSE</code></strong> to continue
</span>
</dd>
<dt id="constant.zend-new">
<strong><code>ZEND_NEW</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</dt>
<dd>
<span class="simpara">
Invoked by object construction, receives the class of object being created as the only argument
</span>
</dd>
<dt id="constant.zend-throw">
<strong><code>ZEND_THROW</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</dt>
<dd>
<span class="simpara">
Invoked by the throw construct, receives the class of exception being thrown as the only argument
</span>
</dd>
<dt id="constant.zend-fetch-class">
<strong><code>ZEND_FETCH_CLASS</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</dt>
<dd>
<span class="simpara">
Invoked upon composure, recieves the class the name of the class being fetched as the only argument
</span>
</dd>
<dt id="constant.zend-add-trait">
<strong><code>ZEND_ADD_TRAIT</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</dt>
<dd>
<span class="simpara">
Invoked upon composure, recieves the class the trait is being added to as the first argument, and the name of the trait as the second argument
</span>
</dd>
<dt id="constant.zend-add-interface">
<strong><code>ZEND_ADD_INTERFACE</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</dt>
<dd>
<span class="simpara">
Invoked upon composure, recieves the class the interface is being added to as the first argument, and the name of the interface as the second argument
</span>
</dd>
<dt id="constant.zend-instanceof">
<strong><code>ZEND_INSTANCEOF</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</dt>
<dd>
<span class="simpara">
Invoked by instanceof operator, recieves the object being verified as the first argument, and the name of the class which that object should be as the second argument
</span>
</dd>
</dl>
</p>
<p class="para">
The following constants control the VM's behaviour after a user handler is invoked, be extremely careful!
</p>
<p class="para">
<dl>
<dt id="constant.zend-user-opcode-continue">
<strong><code>ZEND_USER_OPCODE_CONTINUE</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</dt>
<dd>
<span class="simpara">
Advance 1 opcode and continuue
</span>
</dd>
<dt id="constant.zend-user-opcode-enter">
<strong><code>ZEND_USER_OPCODE_ENTER</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</dt>
<dd>
<span class="simpara">
Enter into new op_array without recursion
</span>
</dd>
<dt id="constant.zend-user-opcode-leave">
<strong><code>ZEND_USER_OPCODE_LEAVE</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</dt>
<dd>
<span class="simpara">
Return to calling op_array within the same executor
</span>
</dd>
<dt id="constant.zend-user-opcode-dispatch">
<strong><code>ZEND_USER_OPCODE_DISPATCH</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</dt>
<dd>
<span class="simpara">
Dispatch to original opcode handler
</span>
</dd>
<dt id="constant.zend-user-opcode-dispatch-to">
<strong><code>ZEND_USER_OPCODE_DISPATCH_TO</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</dt>
<dd>
<span class="simpara">
Dispatch to a specific handler (OR'd with ZEND opcode constant)
</span>
</dd>
<dt id="constant.zend-user-opcode-return">
<strong><code>ZEND_USER_OPCODE_RETURN</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</dt>
<dd>
<span class="simpara">
Exit from executor (return from function)
</span>
</dd>
</dl>
</p>
<p class="para">
The following modifiers are registered as constants by uopz
</p>
<p class="para">
<dl>
<dt id="constant.zend-acc-public">
<strong><code>ZEND_ACC_PUBLIC</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</dt>
<dd>
<span class="simpara">
Mark function as public, the default
</span>
</dd>
<dt id="constant.zend-acc-protected">
<strong><code>ZEND_ACC_PROTECTED</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</dt>
<dd>
<span class="simpara">
Mark function as protected
</span>
</dd>
<dt id="constant.zend-acc-private">
<strong><code>ZEND_ACC_PRIVATE</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</dt>
<dd>
<span class="simpara">
Mark function as private
</span>
</dd>
<dt id="constant.zend-acc-static">
<strong><code>ZEND_ACC_STATIC</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</dt>
<dd>
<span class="simpara">
Mark function as static
</span>
</dd>
<dt id="constant.zend-acc-final">
<strong><code>ZEND_ACC_FINAL</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</dt>
<dd>
<span class="simpara">
Mark function as final
</span>
</dd>
<dt id="constant.zend-acc-abstract">
<strong><code>ZEND_ACC_ABSTRACT</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</dt>
<dd>
<span class="simpara">
Mark function as abstract
</span>
</dd>
<dt id="constant.zend-acc-class">
<strong><code>ZEND_ACC_CLASS</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</dt>
<dd>
<span class="simpara">
Dummy registered for consistency, the default kind of class entry
</span>
</dd>
<dt id="constant.zend-acc-interface">
<strong><code>ZEND_ACC_INTERFACE</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</dt>
<dd>
<span class="simpara">
Mark class as interface
</span>
</dd>
<dt id="constant.zend-acc-trait">
<strong><code>ZEND_ACC_TRAIT</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</dt>
<dd>
<span class="simpara">
Mark class as trait
</span>
</dd>
<dt id="constant.zend-acc-fetch">
<strong><code>ZEND_ACC_FETCH</code></strong>
(<span class="type"><a href="language.types.integer.html" class="type integer">integer</a></span>)
</dt>
<dd>
<span class="simpara">
Used for getting flags only
</span>
</dd>
</dl>
</p>
</div>
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