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<?php //PHPの関数 //様々な関数 $a =""; //empty関数 /*以下の場合にTRUE ・空白の数値 ・文字列、配列、数値の0 ・文字列の半角の0 ・NULLやFALSE ・変数が定義されただけの状態*/ $_a=empty($a); echo $_a.PHP_EOL;
based on 0SZjJ
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/isOO0
function name:  (null)
number of ops:  6
compiled vars:  !0 = $a, !1 = $_a
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   5     0  E >   ASSIGN                                                   !0, ''
  14     1        ISSET_ISEMPTY_CV                                 ~3      !0
         2        ASSIGN                                                   !1, ~3
  15     3        CONCAT                                           ~5      !1, '%0A'
         4        ECHO                                                     ~5
  16     5      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.4.0