How Variables Are Passed Through Arguments
Q
How Variables Are Passed Through Arguments? - PHP Script Tips - Creating Your Own Functions
✍: FYIcenter.com
A
Like more of other programming languages, variables are passed through arguments by values, not by references. That means when a variable is passed as an argument, a copy of the value will be passed into the function. Modifying that copy inside the function will not impact the original copy. Here is a PHP script on passing variables by values:
<?php
function swap($a, $b) {
$t = $a;
$a = $b;
$b = $t;
}
$x = "PHP";
$y = "JSP";
print("Before swapping: $x, $y\n");
swap($x, $y);
print("After swapping: $x, $y\n");
?>
This script will print:
Before swapping: PHP, JSP After swapping: PHP, JSP
As you can see, original variables were not affected.
2007-04-24, 4771👍, 0💬
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