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    ceil

    (PHP 4, PHP 5, PHP 7, PHP 8)

    ceil — 端数の切り上げ

    説明

    ceil(int|float $num): float

    必要に応じて num を切り上げ、 num の次に大きい整数値を返します。

    パラメータ

    num

    丸める値。

    戻り値

    num の次に大きい整数値を返します。 ceil() の戻り値は float 型と なります。これは、float 値の範囲は通常 int よりも広いためです。

    変更履歴

    バージョン 説明
    8.0.0 num は、 数値への変換をサポートした内部オブジェクトを受け入れなくなりました。

    例

    例1 ceil() の例

    <?php
    echo ceil(4.3); // 5
    echo ceil(9.999); // 10
    echo ceil(-3.14); // -3
    ?>

    参考

    • floor() - 端数の切り捨て
    • round() - 浮動小数点数を丸める

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    User Contributed Notes 5 notes

    up
    87
    Scott Weaver / scottmweaver * gmail
    16 years ago
    I needed this and couldn't find it so I thought someone else wouldn't have to look through a bunch of Google results-

    <?php

    // duplicates m$ excel's ceiling function
    if( !function_exists('ceiling') )
    {
    function     ceiling($number, $significance = 1)
    {
    return (     is_numeric($number) && is_numeric($significance) ) ? (ceil($number/$significance)*$significance) : false;
    }
    }

    echo     ceiling(0, 1000); // 0
    echo ceiling(1, 1); // 1000
    echo ceiling(1001, 1000); // 2000
    echo ceiling(1.27, 0.05); // 1.30

    ?>
    up
    49
    eep2004 at ukr dot net
    6 years ago
    Caution!
    <?php
    $value     = 77.4;
    echo     ceil($value * 100) / 100; // 77.41 - WRONG!
    echo ceil(round($value * 100)) / 100; // 77.4 - OK!
    up
    24
    steve_phpnet // nanovox \\ com
    19 years ago
    I couldn't find any functions to do what ceiling does while still leaving I specified number of decimal places, so I wrote a couple functions myself. round_up is like ceil but allows you to specify a number of decimal places. round_out does the same, but rounds away from zero.

    <?php
    // round_up:
    // rounds up a float to a specified number of decimal places
    // (basically acts like ceil() but allows for decimal places)
    function round_up ($value, $places=0) {
    if (    $places < 0) { $places = 0; }
    $mult = pow(10, $places);
    return     ceil($value * $mult) / $mult;
    }

    // round_out:
    // rounds a float away from zero to a specified number of decimal places
    function round_out ($value, $places=0) {
    if (    $places < 0) { $places = 0; }
    $mult = pow(10, $places);
    return (    $value >= 0 ? ceil($value * $mult):floor($value * $mult)) / $mult;
    }

    echo     round_up (56.77001, 2); // displays 56.78
    echo round_up (-0.453001, 4); // displays -0.453
    echo round_out (56.77001, 2); // displays 56.78
    echo round_out (-0.453001, 4); // displays -0.4531
    ?>
    up
    14
    oktam
    13 years ago
    Actual behaviour:
    echo ceil(-0.1); //result "-0" but i expect "0"

    Workaround:
    echo ceil(-0.1)+0; //result "0"
    up
    8
    frozenfire at php dot net
    12 years ago
    Please see http://www.php.net/manual/en/language.types.float.php for information regarding floating point precision issues.
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