从 float（数字）到 int 的隐式转换会丢失精度-PHP中文网问答

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从 float（数字）到 int 的隐式转换会丢失精度

P粉449281068 2023-10-21 18:33:55

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1657

我在 php 8.1 之前曾经使用过这个公式

<?php
$number = 0;
echo log10(abs($number)) / 3 | 0;

echo PHP_EOL;

$number = 100;
echo log10(abs($number)) / 3 | 0;

echo PHP_EOL;
    
$number = 1100;
echo log10(abs($number)) / 3 | 0;

echo PHP_EOL;
    
$number = 10000000;
echo log10(abs($number)) / 3 | 0;
?>

它工作得很好，但现在升级后我不断收到这些错误

Deprecated: Implicit conversion from float -INF to int loses precision

Deprecated: Implicit conversion from float 0.6666666666666666 to int loses precision

Deprecated: Implicit conversion from float 1.0137975617194084 to int loses precision

Deprecated: Implicit conversion from float 2.3333333333333335 to int loses precision

我无法从 8.1 文档中找到或理解为什么现在会发生这种情况

P粉449281068

全部回复(2)

P粉0432953372023-10-22 12:07:10 2楼

// Implicit variant
$number= "2";
$calc = 2 + $number;

// Cast variant
$number = "2";
$calc= 2 + (int) $number;

// Explicit variant
$number = "2";
$calc = 2 + intval($number);

// Everything is good variant ^^
$number = 2;
$calc = 2 + $number;