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Home Backend Development PHP Tutorial PHP算法:如何把 00301.0050600变成正整数30100506

PHP算法:如何把 00301.0050600变成正整数30100506

Jun 06, 2016 pm 08:40 PM
php algorithm

<code><br>/**
 * @description 小数点变成正整数
 *
 * @param $str
 *
 * @return mixed
 */
function toIntegerNum($str)
{
    $str = preg_replace('/(\.\d+)([0]*)/' , '\\1' , $str);
    $str = str_replace('.' , '' , $str);

    return $str;
}

$s = 00301.0050600;
var_dump(toIntegerNum($s)); //输出string '30100506' (length=8)
</code>
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新修改

重新改写了一下,还有更好的方法吗

<code>/**
 * @description 小数点变成正整数
 *
 * @param $str
 *
 * @return mixed
 */
function toIntegerNum($str)
{
    $arr = explode('.' , $str);

    if (!empty($arr[0])) {
        $arr[0] = ltrim($arr[0] , '0');
    }

    if (!empty($arr[1])) {
        $arr[1] = rtrim($arr[1] , '0');
    }

    return ltrim(implode('' , $arr),'0');
}

$s = '00301.0050600';
//$s = 00301.0050600;
//$s = 300;
$s = 0.00560000;
var_dump(toIntegerNum($s));
</code>
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回复内容:

<code><br>/**
 * @description 小数点变成正整数
 *
 * @param $str
 *
 * @return mixed
 */
function toIntegerNum($str)
{
    $str = preg_replace('/(\.\d+)([0]*)/' , '\\1' , $str);
    $str = str_replace('.' , '' , $str);

    return $str;
}

$s = 00301.0050600;
var_dump(toIntegerNum($s)); //输出string '30100506' (length=8)
</code>
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Copy after login

新修改

重新改写了一下,还有更好的方法吗

<code>/**
 * @description 小数点变成正整数
 *
 * @param $str
 *
 * @return mixed
 */
function toIntegerNum($str)
{
    $arr = explode('.' , $str);

    if (!empty($arr[0])) {
        $arr[0] = ltrim($arr[0] , '0');
    }

    if (!empty($arr[1])) {
        $arr[1] = rtrim($arr[1] , '0');
    }

    return ltrim(implode('' , $arr),'0');
}

$s = '00301.0050600';
//$s = 00301.0050600;
//$s = 300;
$s = 0.00560000;
var_dump(toIntegerNum($s));
</code>
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按状态来解析:

  1. 记录整数部分头部零:
    从前往后逐位解析一遍,记录头部零的位数,直到遇到非零值或结尾;
  2. 记录小数部分尾部零:
    如果有小数点,则从后往前逐位解析一遍,记录尾部零的位数,直到遇到非零值或小数点;
  3. 把头部零和尾部0全部刨除,最后去掉小数点。

LZ已经给出答案了啊=w=

<code><?php $a = 00301.0050600;

    echo str_replace('.', '', floatval($a));
</code></code>
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<code>return trim(str_replace('.','',$str),'0')
</code>
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借 @tczzjin 的答案

<code>$str = 00301.0050600;
echo intval(str_replace('.','',$str));
</code>
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