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PHP - Manual: CASE - 互联网笔记

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PHP官方手册 - 互联网笔记

PHP - Manual: CASE

2025-06-08

CASE

PHP code

<?php
/*
 * Set result to true if value1 equals value2.  The value2 must be a constant value?
 * opcode number: 48
 */
$i=0;
switch (
$i) {
   case 
0:
         echo 
"i=0";
         break;
   case 
1:
         echo 
"i=1";
         break;
   case 
2:
         echo 
"i=2";
         break;
}
?>

PHP opcodes

Function name: (null)

Compiled variables: !0=$i

line#op fetchextreturn operands
60 ASSIGN     !0,0
81 CASE   ~1 !0,0
 2 JMPZ     ~1,->6
93 ECHO     'i%3D0'
104 BRK     1
115 JMP     ->8
 6 CASE   ~1 !0,1
 7 JMPZ     ~1,->11
128 ECHO     'i%3D1'
139 BRK     1
1410 JMP     ->13
 11 CASE   ~1 !0,2
 12 JMPZ     ~1,->16
1513 ECHO     'i%3D2'
1614 BRK     1
1715 JMP     ->16
1816 RETURN     1
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官方地址:https://www.php.net/manual/en/internals2.opcodes.case.php

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