what does this mean? +=

[seany123]

is anyone able to explain what this code is saying?

 

i had it written for me awhile back and now that i wanna change it about to make it my own etc i dont really know what each part is doing... esspecially the += part lol.

 

 

im using a form which includes this:

 

<input type="hidden" name="item_name" value="50 Awake Pills" />

 

and then from the form above this code is used:

 

$total = ereg_replace( "[^A-Za-z0-9]", "", $_REQUEST['item_name'] );

$total += 0;

for ( $i = 0; $i < $total; $i++ )

[ram4nd]

"$total += 0;" adds 0 to variable "$total". What is pointless.

[KevinM1]

More to the point, += is shorthand for writing:

 

$total = $total + 0;

 

There are other similar shorthand operators, including -=, *=, and even .=

[ram4nd]

What does *= do?

[seany123]

What does *= do?

 

im guessing *= is the same as += except you * it instead of + it. lol

 

 

 

what about this part:

 

for ( $i = 0; $i < $total; $i++ )

[salathe]

Please see PHP Operators, in particular the Arithmetic and Assignment operators for things like += and *=. For ++, see incrementing/decrementing.  For for see the for control structure.

[cags]

*= $value 

is the same as $total = $total * $value.

 

.= $value

is the same as $total = $total . $value or even $total = "$total$value"

 

for ( $i = 0; $i < $total; $i++ )

 

is saying while $i is less than $total, loop, adding 1 to $i on each iteration ($i++ is the same as $i = $i + 1). It could also be written as

 

$i = 0;
while($i < $total) {
   $i++;
}

 

Faux Edit: But I recommend reading the links provided by salathe.