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<?php
 
$str='[0,"^(\\\\w)+$","Your email is unvailable"]';
$arr= json_decode($str,true);
var_dump($arr); // null

Success #stdin #stdout 0.01s 20520KB

stdin

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Standard input is empty

stdout

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array(3) {
  [0]=>
  int(0)
  [1]=>
  string(7) "^(\w)+$"
  [2]=>
  string(24) "Your email is unvailable"
}

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language:

PHP (php 7.3.5)

created:

visibility:

public

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