php教程

MOD

PHP code

<?php
/*
 * Makes the value of "result" congruent to "value1" modulo "value2".
 * opcode number: 5
 */
echo 6 % 3;
?>

PHP opcodes

Function name: (null)

Compiled variables: none

line#op fetchextreturn operands
60 MOD   ~0 6,3
 1 ECHO     ~0
72 RETURN     1

User Contributed Notes

martynas dot stropa at gmail dot com 28-Oct-2014 04:45
A function to handle integers of any length, including negatives. Returns remainder but also calculates division in the process (could be useful in some cases).

<?php
function remainder($dividend, $divisor) {
    if ($dividend == 0 || $divisor == 0) return 0;

    $dividend .= '';
    $remainder = 0;
    $division = '';
   
    // negative case
    while ($dividend < 0) {
        $dividend += $divisor;
        if ($dividend >= 0) return $dividend;
    }
   
    // positive case
    while (($remainder.$dividend)*1 > $divisor) {
        // get remainder big enough to divide
        while ($remainder*1 < $divisor) {
            $remainder .= $dividend[0];
            $remainder *= 1;
            $dividend = substr($dividend, 1);
        }
       
        // get highest multiplicator for remainder
        $mult = floor($remainder / $divisor);

        // add multiplicator to division
        $division .= $mult.'';

        // subtract from remainder
        $remainder -= $mult*$divisor;
    }
   
    // add remaining zeros if any, to division
    if (strlen($dividend) > 0 && $dividend*1 == 0) {
        $division .= $dividend;
    }
   
    return $remainder;
}
doug at unlikelysource dot com 05-Oct-2014 11:30
To determine odd or even it's faster and more efficient to use the bitwise & operator:
$a = 3;
if ($a & 1) {
    echo 'odd';
} else {
    echo 'even';
}
// returns 'odd'
napora dot adam at gmail dot com 25-May-2012 04:22
Might be helpful:

I had to create and "INSERT INTO" on every 50th row:

<?php
$lineBreak = 50;
$tableName = 'user';
$tableFields = 'id, name, password';
?>

in the loop:

<?php
if ($counter === 0 || $counter % $lineBreak === 0) {
    echo "INSERT INTO $tableName ($tableFields) VALUES (";
} else {
    echo ' (';
}

// add values comma-delimited

if ($counter === 0 || $counter % $lineBreak === 0) {
    $insertStmt .= ');';
} else {
    $insertStmt .= '),';
}
?>

(in my case I had to check if $no % $o === 0)

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