php使用substr和substr_replace函数删除字符串最后一个字符

1、使用substr或mb_substr删除字符串最后一个字符

$string = "This is test string..";
echo $string . "\n";

// substr function   http://www.manongjc.com
echo "substr: " . substr($string, 0, -1);

echo "\n";

// mb_substr multibyte version
echo "mb_substr: " . mb_substr($string, 0, -1);

echo "\n";

输出结果：

This is test string..
This is test string.
This is test string.

2、使用substr_replace删除字符串最后一个字符

$string = "This is test string..";
echo $string . "\n";

// substr_replace function
echo "substr_replace: " . substr_replace($string ,"",-1);

echo "\n";

输出结果：

This is test string..
This is test string.