Reference — What does this symbol mean in PHP?
Incrementing / Decrementing Operators
++
increment operator
--
decrement operator
Example Name Effect
---------------------------------------------------------------------
++$a Pre-increment Increments $a by one, then returns $a.
$a++ Post-increment Returns $a, then increments $a by one.
--$a Pre-decrement Decrements $a by one, then returns $a.
$a-- Post-decrement Returns $a, then decrements $a by one.
These can go before or after the variable.
If put before the variable, the increment/decrement operation is done to the variable first then the result is returned. If put after the variable, the variable is first returned, then the increment/decrement operation is done.
For example:
$apples = 10;
for ($i = 0; $i < 10; ++$i) {
echo 'I have ' . $apples-- . " apples. I just ate one.\n";
}
Live example
In the case above ++$i
is used, since it is faster. $i++
would have the same results.
Pre-increment is a little bit faster because it really increments the variable and after that 'returns' the result. Post-increment creates a special variable, copies there the value of the first variable and only after the first variable is used, replaces its value with second's.
However, you must use $apples--
, since first, you want to display the current number of apples, and then you want to subtract one from it.
You can also increment letters in PHP:
$i = "a";
while ($i < "c") {
echo $i++;
}
Once z
is reached aa
is next, and so on.
Note that character variables can be incremented but not decremented and even so only plain ASCII characters (a-z and A-Z) are supported.
Stack Overflow Posts:
- Understanding Incrementing
What does @ mean in PHP?
The @
operator tells PHP to suppress error messages, so that they will not be shown.
For instance, using:
$result = mysql_query("this is an invalid query");
would result in a warning being shown, telling you that the MySQL query is invalid, while
$result = @mysql_query("this is still an invalid query");
would not.
Note, however, that this is very bad programming practice as it does not make error disappear, it just hides them, and it makes debugging a heck of a lot worse since you can't see what's actually wrong with your code.
Instead of using @
, you should disable just error_reporting
and display_errors
display_errors
in php.ini
What does = mean in PHP?
=>
is the separator for associative arrays. In the context of that foreach loop, it assigns the key of the array to $user
and the value to $pass
.
Example:
$user_list = array(
'dave' => 'apassword',
'steve' => 'secr3t'
);
foreach ($user_list as $user => $pass) {
echo "{$user}'s pass is: {$pass}\n";
}
// Prints:
// "dave's pass is: apassword"
// "steve's pass is: secr3t"
Note that this can be used for numerically indexed arrays too.
Example:
$foo = array('car', 'truck', 'van', 'bike', 'rickshaw');
foreach ($foo as $i => $type) {
echo "{$i}: {$type}\n";
}
// prints:
// 0: car
// 1: truck
// 2: van
// 3: bike
// 4: rickshaw
What does operator - mean in PHP?
In your example, $controller
is a PHP object created somewhere, and permissionCheck is a function defined in that object that is being called with the variable $ret
being passed to it. Check this: Reference - What does this symbol mean in PHP?.
What is the meaning of |= in php?
This is bitwise OR operator
$var1 |= $var2; is equal to $var1 = $var1 | $var2;
What does double question mark (??) operator mean in PHP
It's the "null coalescing operator", added in php 7.0. The definition of how it works is:
It returns its first operand if it exists and is not NULL; otherwise it returns its second operand.
So it's actually just isset()
in a handy operator.
Those two are equivalent1:
$foo = $bar ?? 'something';
$foo = isset($bar) ? $bar : 'something';
Documentation: http://php.net/manual/en/language.operators.comparison.php#language.operators.comparison.coalesce
In the list of new PHP7 features: http://php.net/manual/en/migration70.new-features.php#migration70.new-features.null-coalesce-op
And original RFC https://wiki.php.net/rfc/isset_ternary
EDIT: As this answer gets a lot of views, little clarification:
1There is a difference: In case of ??
, the first expression is evaluated only once, as opposed to ? :
, where the expression is first evaluated in the condition section, then the second time in the "answer" section.
What does :: mean in php?
It's the 'Scope Resolution Operator'.
The Scope Resolution Operator (also called Paamayim Nekudotayim) or in
simpler terms, the double colon, is a token that allows access to
static, constant, and overridden properties or methods of a class.
http://php.net/manual/en/language.oop5.paamayim-nekudotayim.php
What does =& mean in PHP?
It passes by reference. Meaning that it won't create a copy of the value passed.
See:
http://php.net/manual/en/language.references.php (See Adam's Answer)
Usually, if you pass something like this:
$a = 5;
$b = $a;
$b = 3;
echo $a; // 5
echo $b; // 3
The original variable ($a
) won't be modified if you change the second variable ($b
) . If you pass by reference:
$a = 5;
$b =& $a;
$b = 3;
echo $a; // 3
echo $b; // 3
The original is changed as well.
Which is useless when passing around objects, because they will be passed by reference by default.
What does '?=' mean in PHP?
It's a shorthand for <?php echo $a; ?>
.
It's enabled by default since 5.4.0 regardless of php.ini
settings.
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