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  1. <?php
  2. $sum = htmlspecialchars($_POST["firstName"]) + htmlspecialchars($_POST["secondName"]);
  3. echo 'Сумма равна ' . $sum . '.';
  4. ?>
Success #stdin #stdout #stderr 0.02s 23812KB
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stdin
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Standard input is empty
stdout
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Сумма равна 0.
stderr
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PHP Notice:  Undefined index: firstName in /home/2Hp4OK/prog.php on line 2
PHP Notice:  Undefined index: secondName in /home/2Hp4OK/prog.php on line 2
PHP Warning:  A non-numeric value encountered in /home/2Hp4OK/prog.php on line 2
PHP Warning:  A non-numeric value encountered in /home/2Hp4OK/prog.php on line 2
https://ideone.com/vyBa8T
language:
PHP (php 7.3.5)
created:
7 years ago
visibility:
public

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