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Tips for golfing in PHP

What general tips do you have for golfing in PHP? I'm looking for ideas that can be applied to code golf problems in general that are at least somewhat specific to PHP (e.g. "remove comments" is not an answer). Please post one tip per answer.

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If this is an answer to a challenge…

…Be sure to follow the challenge specification. However, please refrain from exploiting obvious loopholes. Answers abusing any of the standard loopholes are considered invalid. If you think a specification is unclear or underspecified, comment on the question instead.
…Try to optimize your score. For instance, answers to code-golf challenges should attempt to be as short as possible. You can always include a readable version of the code in addition to the competitive one. Explanations of your answer make it more interesting to read and are very much encouraged.
…Include a short header which indicates the language(s) of your code and its score, as defined by the challenge.

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2

\$\begingroup\$ Indeed, frequently a good replacement, though not exactly the same: pastebin.com/seYeaP38 \$\endgroup\$

manatwork
– manatwork

2017-01-05 19:46:59 +00:00
Commented Jan 5, 2017 at 19:46
\$\begingroup\$ Ah yeah, dang it, I originally had the title "associative arrays ... " and then removed it. I'll clarify, thanks. \$\endgroup\$

Alex Howansky
– Alex Howansky

2017-01-05 19:56:52 +00:00
Commented Jan 5, 2017 at 19:56
\$\begingroup\$ numeric arrays can also merged using +, as long as the indexes are distinct. If they are not, the values from the first array will be overwritten with those from the second one (just like array_merge). The difference: + does not reorder indexes. \$\endgroup\$

Titus
– Titus

2017-01-06 00:11:29 +00:00
Commented Jan 6, 2017 at 0:11

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Correct minor typos or mistakes
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create code fences with backticks ` or tildes ~
```
like so
```
add language identifier to highlight code
```python
def function(foo):
print(foo)
```
put returns between paragraphs
for linebreak add 2 spaces at end
_italic_ or **bold**
indent code by 4 spaces
backtick escapes `like _so_`
quote by placing > at start of line
to make links (use https whenever possible)

<https://example.com>

[example](https://example.com)

<a href="/api/flow.js?q=https%3A%2F%2Fexample.com">example</a>
MathJax equations \$\sin^2 \theta\$

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