PHP数组输出变量不同于数组中显示的变量

打印出来的数组显示$career[2]的值是2010-

然而，无论我怎么尝试，这个如果方程不会触发。这些数组变量会在某些方面有所不同吗?

echo $career[2];
    if($career[2] == "2010-"){
        $career = $career[1];
    } 

数组$career的print_r显示了这个…

 Array ( 
[0] => BIS career 
[1] => CEO of the corp 
[2] => 2010- 
[3] => Leader of R&D 
[4] => 2005-10 
);

VAR转储

    array(11) { 
[0]=> string(316) "BIS career " 
[1]=> string(194) " CEO of the corp " 
[2]=> string(163) " 2010- " 
[3]=> string(160) " Leader of R&D " 
[4]=> string(165) " 2005-10 " }