I recently posted a question in which the code did not work, and was suggested i add apostrophes to my $_POST variables.
$_POST[variable]
$_POST['variable']
$_POST["variable"]
What do you use, and why?
What differences arise when using one of the others?
There is no substantial difference between using " and '. Array keys can be either integers or strings. Strings are quoted in PHP. Not using quotes in this case works, but PHP checks if the key is a constant first, then falling back on interpreting it as a string. Not quoting array keys is discouraged in the PHP documentation.
The first method will throw a Notice:
[18-Feb-2013 02:46:06] PHP Notice: Use of undefined constant variable - assumed 'variable' in /Users/Aram/Development/Web/test.php on line 6
Also, you can't have hyphens, as it will treat them separately.
[18-Feb-2013 02:46:56] PHP Notice: Use of undefined constant variable - assumed 'variable' in /Users/Aram/Development/Web/test.php on line 6
[18-Feb-2013 02:46:56] PHP Notice: Use of undefined constant name - assumed 'name' in /Users/Aram/Development/Web/test.php on line 6
Use single quotes, since it's simpler than double quotes and doesn't require the use of the shift key.
It is not about $_POST variables.
It is about strings.
Strings as array keys to be strict.
You have strings as array keys here - so, you have to format them as strings.
To format strings, you can use whatever quotes, no difference.
variable without quotes is actually a constant.
The only case where you have to omit quotes is a double-quoted string:
echo "Hello $_GET[name], howdy?";
Use $_POST[variable] if variable is the name of a Constant, or a variable: $var.
Use $_POST["variable"] or $_POST['variable'] ifvariable` is a string.
