PHP에서 전체 너비 공백을 제거하는 방법

<?php
$text = " www.qipa250.com ";
$leftTrimmed = ltrim($text);
$rightTrimmed = rtrim($text);
$bothTrimmed = trim($text);
print("leftTrimmed = ($leftTrimmed)");
echo "<hr>";
print("rightTrimmed = ($rightTrimmed)");
echo "<hr>";
print("bothTrimmed = ($bothTrimmed)");
echo "<hr>";
?>

function myTrim($str)
{
    $search = array(" ","　","\n","\r","\t");
    $replace = array("","","","","");
    return str_replace($search, $replace, $str);
}

echo '当前字符串内容：'.$str = 'www.qipa250.com
QIPA250 奇葩天地网 qipa250.com';

echo "<hr>";
echo &#39;过滤后的字符串内容：&#39;.myTrim($str);

echo "<hr>";

echo preg_replace('# #', '', 'ab     ab');
//输出 "abab"