PHP floatval、intval、substr 没有正确返回值

Question

<?php
$Content = "0968571.0569875198.740756475689345823327000000000465735639486589346538946589236587";
echo floatval(substr($Content, 5, 14))."<br />";
echo floatval(substr($Content, 16, 25))."<br />";
echo substr($Content, 27, 37)."<br />";
?>

为什么这段代码返回

71.0569875198
98.740756475689
5689345823327000000000465735639486589

什么时候返回

71.056987
98.740756
5689345823

这只是测试数据!

Answer 1

substr( 字符串 $string , int $start [, int $length ] )

我想你是在想象它是 startIndex 和 endIndex，就像 java 版本的 substring。

你的意思可能是:

echo floatval(substr($Content, 5, 14 - 5))."<br />";
echo floatval(substr($Content, 16, 25 - 16))."<br />";
echo substr($Content, 27, 37 -27)."<br />";