str_replace using array map not returning expected results.

[jasonc310771]

define("corrections", array("<?=" => "<?php echo "));

$newFileContents = str_replace(array_keys(corrections), corrections, $fileContents);

the file contents...

<?
$a = "1";
?><?=$a;?>

I have taken this form https://www.designcise.com/web/tutorial/how-to-replace-words-in-a-string-based-on-a-map-in-php

But do not understand why the newFileContents returned is the same as the original.  Please can someone tell me what I have wrong with the code above ?

EDIT  i just realised i missed out the function to get content, it was only getting the file names.

Edited February 3, 2023 by jasonc310771

[Barand]

Looks OK to me

CODE

define("corrections", array("<?=" => "<?php echo "));

$fileContents = '
<?
$a = "1";
?><?=$a;?>
';

$newFileContents = str_replace(array_keys(corrections), corrections, $fileContents);

echo '<pre>' . htmlentities($newFileContents) . '</pre>';

OUTPUT

<?
$a = "1";
?><?php echo $a;?>