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<?php
$zzz=" 3 ";
$zzz=trim($zzz);
echo "[".$zzz."]<br>";
$zzz=" 3 ";
trim($zzz);
echo "[".$zzz."]<br>";
$zzz=" 3 4 5 ";
trim($zzz);
echo "[".$zzz."]<br>";
$zzz=" 3 4 5 ";
$zzz=trim($zzz);
echo "[".$zzz."]<br>";
?>
$zzz=" 3 ";
trim($zzz);
echo "[".$zzz."]<br>";
<?php
$zzz=" 3 ";
$zzz=trim($zzz);
echo "[".$zzz."]<br>";
$zzz=" 3 ";
trim($zzz);
echo "[".$zzz."]<br>";
$zzz=" 3 4 5 ";
trim($zzz);
echo "[".$zzz."]<br>";
$zzz=" 3 4 5 ";
$zzz=trim($zzz);
echo "[".$zzz."]<br>";
?>
<?php
$zzz=" 3 ";
$zzz=trim($zzz);
echo "[".$zzz."]<br>";
$zzz=" 3 ";
$zzz=trim($zzz);
echo "[".$zzz."]<br>";
$zzz=" 3 4 5 ";
$zzz=trim($zzz);
echo "[".$zzz."]<br>";
$zzz=" 3 4 5 ";
$zzz=trim($zzz);
echo "[".$zzz."]<br>";
?>
$zzz=" 3 ";
$zzz=trim($zzz);
echo "[".$zzz."]<br>";
$zzz=" 3 ";
trim($zzz);
echo "[".$zzz."]<br>";
$zzz=" 3 4 5 ";
trim($zzz);
echo "[".$zzz."]<br>";
$zzz=" 3 4 5 ";
$zzz=trim($zzz);
echo "[".$zzz."]<br>";
//运行结果
/*
[3]
[ 3 ]
[ 3 4 5 ]
[3 4 5]
*/
//结论:trim 截去字符串首尾的空格 是正确的!