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<?php $replacements = array( '[PEDIDO]' => 123, '[NOME]' => 'Bruno Augusto', '[VALOR]' => 69.00, '[FRETE]' => 0, '[DESCONTO]' => 69.00, '[TOTAL]' => 'It\'s FREE!', ); //$msg = preg_replace( '/\[\w+\]/', ); var_dump( preg_quote( array_keys( $replacements ) ) );
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/taSu7
function name:  (null)
number of ops:  11
compiled vars:  !0 = $replacements
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, <array>
   13     1        INIT_FCALL                                               'var_dump'
          2        INIT_FCALL                                               'preg_quote'
          3        INIT_FCALL                                               'array_keys'
          4        SEND_VAR                                                 !0
          5        DO_ICALL                                         $2      
          6        SEND_VAR                                                 $2
          7        DO_ICALL                                         $3      
          8        SEND_VAR                                                 $3
          9        DO_ICALL                                                 
         10      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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