相同字符串不相等的问题

说明：从一个页面采集ip和端口，$ip和$duankou是采集的，然后发现不能用，但是手动输入可以用，对比了
两个字符串，发现长度不相同，但是编码相同，请教这该怎么办
现在是 $b 是有效的，$a无效，

$a="tcp://".$ip.":".$duankou;$b="tcp://77.81.105.147:7808";echo $a."
";echo $b."
"; 	 $encode = mb_detect_encoding($a, array("ASCII","UTF-8","GB2312","GBK","BIG5")); 	  $encodes= mb_detect_encoding($b, array("ASCII","UTF-8","GB2312","GBK","BIG5")); 			   echo $encode."
";		echo $encodes."
";	$changdu1=	strlen($a);	$changdu2=	strlen($b);		echo $changdu1."
";	echo $changdu2;if($a==$b){echo "相等";}else{echo "不等";}

//字符tcp://77.81.105.147:7808tcp://77.81.105.147:7808//编码ASCIIASCII//长度4224//结果不等

回复讨论(解决方案)

var_dump($a, $b, $encode, $encodes);
贴出结果

最好是
echo base64_encode(serialize(array($a, $b, $encode, $encodes)));
贴出结果

采集的数据里有不可见的空字符吧，把ip和port trim（）一下试试

最好是
echo base64_encode(serialize(array($a, $b, $encode, $encodes)));
贴出结果

YTo0OntpOjA7UzoyNDoidGNwOi8vNzcuODEuMTA1LjE0Nzo3ODA4IjtpOjE7Uzo0MjoidGNwOi8vPHRkPjc3LjgxLjEwNS4xNDc8L3RkPjo8dGQ+NzgwODwvdGQ+IjtpOjI7Uzo1OiJBU0NJSSI7aTozO1M6NToiQVNDSUkiO30=

采集的数据里有不可见的空字符吧，把ip和port trim（）一下试试

$s = 'YTo0OntpOjA7UzoyNDoidGNwOi8vNzcuODEuMTA1LjE0Nzo3ODA4IjtpOjE7Uzo0MjoidGNwOi8vPHRkPjc3LjgxLjEwNS4xNDc8L3RkPjo8dGQ+NzgwODwvdGQ+IjtpOjI7Uzo1OiJBU0NJSSI7aTozO1M6NToiQVNDSUkiO30=';$a = unserialize(base64_decode($s));var_dump($a);

array(4) {  [0]=>  string(24) "tcp://77.81.105.147:7808"  [1]=>  string(42) "tcp://77.81.105.147:7808"  [2]=>  string(5) "ASCII"  [3]=>  string(5) "ASCII"}

原来问题在这，我疏忽了，多谢了