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  1. <?php
  2.  
  3. error_reporting(-1);
  4. mb_internal_encoding('utf-8');
  5. $t = "lalala";
  6.  
  7. var_dump(preg_replace("/l(a)/", "-$1-", $t));
  8. var_dump(preg_replace("/l(a)/", "-\\$1-", $t));
  9.  
Success #stdin #stdout 0.01s 20520KB
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stdin
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Standard input is empty
stdout
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string(9) "-a--a--a-"
string(12) "-$1--$1--$1-"
https://ideone.com/OBpwfx
language:
PHP (php 7.3.5)
created:
11 years ago
visibility:
public

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