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  1. <?php
  2.  
  3. $text = 'An apple, some Apples, and a SNAPPLE. Apple! Orange!';
  4.  
  5. echo str_ireplace('apple', '<b>' . 'apple' . '</b>', $text);
  6.  
  7. echo "\n\n";
  8.  
  9. echo preg_replace("/\b(" . 'apple' . ")\b/i", "<b>$1</b>", $text);
Success #stdin #stdout 0.01s 52488KB
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An <b>apple</b>, some <b>apple</b>s, and a SN<b>apple</b>. <b>apple</b>! Orange!

An <b>apple</b>, some Apples, and a SNAPPLE. <b>Apple</b>! Orange!
https://ideone.com/PrdQOS
language:
PHP (php 7.3.5)
created:
9 years ago
visibility:
public

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