Doc #79673 [Com]: "roughly equivalent to" without explaining the difference

From: Date: Wed, 10 Jun 2020 18:18:27 +0000
Subject: Doc #79673 [Com]: "roughly equivalent to" without explaining the difference
References: 1  Groups: php.doc.bugs 
Request: Send a blank email to doc-bugs+get-17642@lists.php.net to get a copy of this message 
Edit report at https://bugs.php.net/bug.php?id=79673&edit=1

 ID:                 79673
 Comment by:         alexinbeijing at gmail dot com
 Reported by:        kasperheij at hotmail dot com
 Summary:            "roughly equivalent to" without explaining the
                     difference
 Status:             Open
 Type:               Documentation Problem
 Package:            Documentation problem
 PHP Version:        7.4.6
 Block user comment: N
 Private report:     N

 New Comment:

Interesting question!

I can't find any difference in the actual behavior, although the bytecodes executed by the
interpreter are different in either case, so it is possible that there might be some (very small)
difference in performance.

See:

https://3v4l.org/Z3dPV/vld#output
https://3v4l.org/2W7W1/vld#output


Previous Comments:
------------------------------------------------------------------------
[2020-06-04 11:21:51] kasperheij at hotmail dot com

Description:
------------
---
From manual page: https://php.net/migration74.new-features
---

```
<?php
$array['key'] ??= computeDefault();
// is roughly equivalent to
if (!isset($array['key'])) {
    $array['key'] = computeDefault();
}
?>
```

"// is roughly equivalent to" says that there _is_ a difference without specifying this
delta.





------------------------------------------------------------------------



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Edit this bug report at https://bugs.php.net/bug.php?id=79673&edit=1

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