International PHP Conference 2015

CONCAT

PHP code

<?php
/*
 * Concats string values string1 and string2
 * opcode number: 8
 */
echo "hello" "world";
?>

PHP opcodes

Function name: (null)

Compiled variables: none

line#op fetchextreturn operands
60 CONCAT   ~0 'hello','world'
 1 ECHO     ~0
72 RETURN     1
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