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PHP Manual [ISSET_ISEMPTY_VAR]

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PHP Manual || Opcode Descriptions and Examples

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

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


PHP Manual || Opcode Descriptions and Examples