what does miltiply mean in php

If the word miltiply appears in a PHP library function, it usually means "multiplication"; if it is customized by a developer, it depends on the developer's intention and whether the wording is appropriate, such as custom The miltiply method is like "functionmul($a,$b){$lenA=strlen($a);$lenB=strlen($b);$result= '0';for($inxA=$lenA- 1;$ inxA>= 0; ) {...}".

The operating environment of this tutorial: Windows 7 system, PHP version 8.1, Dell G3 computer.

What does miltiply mean in php?

If this word appears in a PHP library function, multiply usually represents "multiplication";

If it is customized, it depends on the author's intention and whether the wording is appropriate.

For example:

PHP实现大数相加、大数相乘
最基本的模拟竖式的计算方法：

<?php

/* multiply

* a,b should be numeric

* @param $a string

* @param $b string

* @return string

*/

functionmul($a,$b)

{

    $lenA=strlen($a);

    $lenB=strlen($b);

    $result= &#39;0&#39;;

    for($inxA=$lenA- 1;$inxA>= 0; --$inxA) {

        $re= &#39;&#39;;

        for($i=$inxA+ 1;$i<$lenA; ++$i) {

            $re= "0" .$re;

        }

        $j= 0;

        for($inxB=$lenB- 1;$inxB>= 0; --$inxB) {

            $mul= (int)$a[$inxA] * (int)$b[$inxB] +$j;

            if($mul>= 10) {

                $j=floor($mul/ 10);

                $mul=$mul-$j* 10;

            } else {

                $j= 0;

            }

            $re= (string)$mul.$re;

        }

        if($j> 0)$re= (string)$j.$re;

        $result= add($result,$re);

    }

    return$result;

}

/**

* add

* a,b should be numeric

* @param $a string

* @param $b string

* @return string

*/

functionadd($a,$b)

{

    $lenA=strlen($a);

    $lenB=strlen($b);

    $j= 0;

    $re= &#39;&#39;;

    for($inxA=$lenA- 1,$inxB=$lenB- 1; ($inxA>= 0 ||$inxB>= 0); --$inxA, --$inxB) {

        $itemA= ($inxA>= 0) ? (int)$a[$inxA] : 0;

        $itemB= ($inxB>= 0) ? (int)$b[$inxB] : 0;

        $sum=$itemA+$itemB+$j;

        if($sum> 9) {

            $j= 1;

            $sum=$sum- 10;

        } else {

            $j= 0;

        }

        $re= (string)$sum.$re;

    }

    if($j> 0)$re= (string)$j.$re;

    return$re;

}

?>

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