hash_copy() – Copying a Hash Context in PHP

The hash_copy() function creates a duplicate of a hash context resource that was originally created by hash_init(). This allows the original context to continue being used while the copy can be processed independently.

Parameter $context – The hash context resource returned by hash_init().

Return value

Returns a new resource that is a copy of the provided hash context.

Example

<?php
$context = hash_init("md5");
hash_update($context, "data");
// Copy the context resource for further use
$copy_context = hash_copy($context);

echo hash_final($context), "
";

hash_update($copy_context, "data");
echo hash_final($copy_context), "
";
?>

Output

8d777f385d3dfec8815d20f7496026dc
511ae0b1c13f95e5f08f1a0dd3da3d93