A valid variable name:
- Starts with a dollar sign ($)
- Followed by either a letter or underscore
- Can contain numbers, numbers, underscores, dashes (hyphen)
- Case-Sensitive
- No spaces
$Products; $salePrice; $sale_price; $item3; $_itemName; $__itemPrice;Avoid these variable format:
$_itemPrice; //PHP defined variables, $_POST, $_GET etc. $__itemPrice; //double/triple/four underscore can be confusingLets take Variables in action:
<html>
<head>
<title>PHP Variables</title>
</head>
<body>
<?php
$price1 = 25;
echo $price1 . '<br />';
$products = 'product lowercase';
$Products = 'product uppercase';
echo $products . '<br />';
echo $Products . '<br />';
$price1 = 500;
echo $price1;
?>
</body>
</html>
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