PHP $GLOBALS (super global) variable
Description
$GLOBAL is a php super global variable which can be used instead of 'global' keyword to access variables from global scope, i.e. the variables which can be accessed from anywhere in a php script even within functions or methods.
Here is an example to testify the theory mentioned above:
<?php
$s = 25;
$t = 50;
function subtraction()
{
$GLOBALS['v'] = $GLOBALS['t'] - $GLOBALS['s'];
}
subtraction();
echo $v;
?>
In the code above, since v is a variable present within $GLOBALS array,
it is accessible form outside the function also.
View the example of $GLOBALS variable in the browser
PHP: Tips of the Day
In PHP, there are two versions of logical AND and OR operators.
Operator | True if |
---|---|
$a and $b | Both $a and $b are true |
$a && $b | Both $a and $b are true |
$a or $b | Either $a or $b is true |
$a || $b | Either $a or $b is true |
Note that the && and || opererators have higher precedence than and and or. See table below:
Evaluation | Result of $e | Evaluated as |
---|---|---|
$e = false || true | True | $e = (false || true) |
$e = false or true | False | ($e = false) or true |
Because of this it's safer to use && and || instead of and and or.
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