phpversion

string phpversion ([ string $extension ] )

<?php
//?prints?e.g.?'Current?PHP?version:?4.1.1'
echo?'Current?PHP?version:?'?.?phpversion();

//?prints?e.g.?'2.0'?or?nothing?if?the?extension?isn't?enabled
echo?phpversion('tidy');
?>

<?php
//?PHP_VERSION_ID?is?available?as?of?PHP?5.2.7,?if?our?
//?version?is?lower?than?that,?then?emulate?it
if?(!defined('PHP_VERSION_ID'))?{
????$version?=?explode('.',?PHP_VERSION);

????define('PHP_VERSION_ID',?($version[0]?*?10000?+?$version[1]?*?100?+?$version[2]));
}

//?PHP_VERSION_ID?is?defined?as?a?number,?where?the?higher?the?number?
//?is,?the?newer?a?PHP?version?is?used.?It's?defined?as?used?in?the?above?
//?expression:
//
//?$version_id?=?$major_version?*?10000?+?$minor_version?*?100?+?$release_version;
//
//?Now?with?PHP_VERSION_ID?we?can?check?for?features?this?PHP?version?
//?may?have,?this?doesn't?require?to?use?version_compare()?everytime?
//?you?check?if?the?current?PHP?version?may?not?support?a?feature.
//
//?For?example,?we?may?here?define?the?PHP_VERSION_*?constants?thats?
//?not?available?in?versions?prior?to?5.2.7

if?(PHP_VERSION_ID?<?50207)?{
????define('PHP_MAJOR_VERSION',???$version[0]);
????define('PHP_MINOR_VERSION',???$version[1]);
????define('PHP_RELEASE_VERSION',?$version[2]);

????//?and?so?on,?...
}
?>

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