Tools, FAQ, Tutorials:
Variables Are Passed by Values in PHP
How Variables Are Passed Through Arguments? in PHP?
✍: FYIcenter.com
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.
⇒ Passing Variables by References in PHP
⇐ Passing an Argument to a Function in PHP
2016-12-24, 1407👍, 0💬
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