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  1. <?php
  2.  
  3. $input = "\t\n\r \tfoo";
  4.  
  5.     function lspace($input) {
  6.         if ($input && ($input = strval($input))) {
  7.             if (preg_match('/^\s*/', $input, $matches)) {
  8.                 return $matches[0];
  9.             }
  10.         }
  11.         return '';
  12.     }
  13.  
  14. var_dump(lspace("foo"));
  15. var_dump(lspace("  foo"));
  16. var_dump(lspace("  \t  foo"));
  17. var_dump(lspace("\n  \tfoo"));
Success #stdin #stdout 0.01s 52488KB
comments (?)
stdin
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Standard input is empty
stdout
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string(0) ""
string(2) "  "
string(5) "  	  "
string(4) "
  	"
https://ideone.com/PO2Xoq
language:
PHP (php 7.3.5)
created:
7 years ago
visibility:
public

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