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  1. <?php
  2.  
  3. error_reporting (-1);
  4.  
  5.  
  6. for ($a = 1; $a < 10; $a++, $sum = $a * $a) {
  7. 	echo "$a * $a = $sum\n";
  8. }
  9.  
  10.  
Success #stdin #stdout #stderr 0.02s 23788KB
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stdin
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Standard input is empty
stdout
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1 * 1 = 
2 * 2 = 4
3 * 3 = 9
4 * 4 = 16
5 * 5 = 25
6 * 6 = 36
7 * 7 = 49
8 * 8 = 64
9 * 9 = 81
stderr
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PHP Notice:  Undefined variable: sum in /home/JgBYeR/prog.php on line 7
https://ideone.com/qawxeR
language:
PHP (php 7.3.5)
created:
6 years ago
visibility:
public

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