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14 December, 2020

Reference — What does this symbol mean in PHP?

 Programing Coderfunda     December 14, 2020     Php Question     No comments   

 


    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.


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