What does += mean in PHP?

The final operator that we are going to discuss in this article is the addition assignment operator. The ?=, +=, and -= are all used to assign a value to a variable based on a condition. The last part is where they differ. Just remember, almost always in PHP, you can't use both assignments (=) and the equal sign for comparisons without using parentheses.

php +=

on Jan 01, 1970 
$my_var = "foo";
$my_var .= " bar";
echo($my_var);
// foo bar

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php ajouter += ou =+

on Jan 01, 1970 
$a=0;
$a+=5;

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php ++

on Jan 01, 1970 
// POST INCREMENTING
$i = 10;
$a = $i++;
// Now $a is 10, and $i is 11

//PRE INCREMENTING : it is FASTER (-10% than previous above)
$i = 10;
$a = ++$i;
// Now $a is 11, and $i is 11

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The conditional operator in PHP is used to perform an operation or run a block of code if and only if the operands are true. The syntax for this is mentioned above.

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