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  1. <?php
  2. /**
  3.  * Echo img tag
  4.  *
  5.  * @param  integer $fileno
  6.  * @return string
  7.  */
  8. function echo_img_tag( $fileno = 001 ) {
  9. 	if ( preg_match( '/\A([0-9]{2,3}+)\z/', $fileno ) )
  10. 		return '<img src="./images/img' . $fileno . '.jpg">';
  11. 	else
  12. 		return '<img src="./images/noimage.jpg">';
  13. }
  14.  
  15. echo echo_img_tag( $_GET['no'] );
Success #stdin #stdout #stderr 0.02s 24144KB
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stdin
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002
stdout
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<img src="./images/noimage.jpg">
stderr
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PHP Notice:  Undefined index: no in /home/WRSz9Z/prog.php on line 14
https://ideone.com/Bj6e7g
language:
PHP (php 7.3.5)
created:
10 years ago
visibility:
public

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