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PHP - Manual: ISSET_ISEMPTY_VAR - 互联网笔记

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PHP - Manual: ISSET_ISEMPTY_VAR

2025-06-09

ISSET_ISEMPTY_VAR

PHP code

<?php
/*
 * Tests if the value of a variable is set or not.
 * opcode number: 114
 */
if(isset($a)){ return 0;}
?>

PHP opcodes

Function name: (null)

Compiled variables: !0=$a

line#op fetchextreturn operands
60 ZEND_ISSET_ISEMPTY_VAR  5~0 !0
 1 JMPZ     ~0,->4
 2 RETURN     0
 3 JMP     ->4
74 RETURN     1
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官方地址:https://www.php.net/manual/en/internals2.opcodes.isset-isempty-var.php

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