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<?php $spl = new SplFileObject('php://temp', 'r'); $fh = fopen('php://temp', 'r'); var_export([ 'SplFileObject::fputcsv result on failure' => $spl->fputcsv(['foo', 'bar']), 'SplFileObject::fwrite result on failure' => $spl->fwrite('foo'), 'fputcsv result on failure' => fputcsv($fh, ['foo', 'bar']), 'fwrite result on failure' => fwrite($fh, 'foo'), ]);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/ifpaa
function name:  (null)
number of ops:  32
compiled vars:  !0 = $spl, !1 = $fh
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    4     0  E >   NEW                                              $2      'SplFileObject'
          1        SEND_VAL_EX                                              'php%3A%2F%2Ftemp'
          2        SEND_VAL_EX                                              'r'
          3        DO_FCALL                                      0          
          4        ASSIGN                                                   !0, $2
    5     5        INIT_FCALL                                               'fopen'
          6        SEND_VAL                                                 'php%3A%2F%2Ftemp'
          7        SEND_VAL                                                 'r'
          8        DO_ICALL                                         $5      
          9        ASSIGN                                                   !1, $5
    7    10        INIT_FCALL                                               'var_export'
    8    11        INIT_METHOD_CALL                                         !0, 'fputcsv'
         12        SEND_VAL_EX                                              <array>
         13        DO_FCALL                                      0  $7      
         14        INIT_ARRAY                                       ~8      $7, 'SplFileObject%3A%3Afputcsv+result+on+failure'
    9    15        INIT_METHOD_CALL                                         !0, 'fwrite'
         16        SEND_VAL_EX                                              'foo'
         17        DO_FCALL                                      0  $9      
         18        ADD_ARRAY_ELEMENT                                ~8      $9, 'SplFileObject%3A%3Afwrite+result+on+failure'
   10    19        INIT_FCALL                                               'fputcsv'
         20        SEND_VAR                                                 !1
         21        SEND_VAL                                                 <array>
         22        DO_ICALL                                         $10     
         23        ADD_ARRAY_ELEMENT                                ~8      $10, 'fputcsv+result+on+failure'
   11    24        INIT_FCALL                                               'fwrite'
         25        SEND_VAR                                                 !1
         26        SEND_VAL                                                 'foo'
         27        DO_ICALL                                         $11     
         28        ADD_ARRAY_ELEMENT                                ~8      $11, 'fwrite+result+on+failure'
         29        SEND_VAL                                                 ~8
         30        DO_ICALL                                                 
   12    31      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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