PHP version Check

Question

So I'm basically trying to create a tool that used across platforms, including sometimes legacy php version.

I don't plan on supporting anything less than 5.4 so I'd like to use something like below; however, instead of the application dying, I get various syntax errors. One of the first to start alerting is using brackets to define arrays.

Is there anyway to get around this?

if (version_compare(phpversion(), '5.4', '<')) {
    die('This tool does not support anything < PHP 5.4<br>Your PHP version is: '.phpversion() );
}

$array= ['a','b','c'];

PHP checks the script syntax before running any of it. So if you use new syntax, it will never get to the version_compare(). You have to stick to old syntax. — Barmar
– Barmar, Commented Jun 13, 2018 at 21:05
@Seblor He already knows how to get the version, don't you see the code? — Barmar
– Barmar, Commented Jun 13, 2018 at 21:05
@Barmar I may have skipped it, I read the question before the edit. My bad. — Seblor
– Seblor, Commented Jun 13, 2018 at 21:06

Evert · Accepted Answer · 2018-06-13 21:03:01Z

1

The file you are doing a version_check for should simply not use any newer PHP features or include any files that do. If you want the version_check to work on PHP 4, it can only use PHP 4 features.

answered Jun 13, 2018 at 21:03

Evert

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2 Comments

Barmar Over a year ago

It can call newer functions, it just has to limit itself to legacy syntax. The version check will work as long as the syntax is valid.

Scott Over a year ago

Thanks Barmar, this was is what I was afraid of. The brackets would by far be the easiest thing to address.

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