PHP explode（）和If语句

Question

I literally spent 6 hours trying to find this out. I have the code below:

$pieces3 = explode(":", $value2);
$checkiftime = $pieces3[0];
if ($checkiftime == 'time')
{
echo "Yes!";
}
else
{
echo "Oh no!";
}

$value2 contains:

" 'time': 1376952971"

I'm pretty sure the statement should be true but for some reasons, I keep getting false (oh no!)

if ($checkiftime == 'time')

What could be wrong? I already tried using double quotes for $checkiftime=="time" but still no avail.

EDIT:

I tried doing Vardumps after the explode:

var_dump($pieces3);
echo "<br>";
var_dump($value2);
echo "<br>";
var_dump($pieces3[0]);
echo "<br>";

And resulted with:

array(2) { [0]=> string(13) " 'time'" [1]=> string(11) " 1376952971" } 
string(25) " 'time': 1376952971" 
string(13) " 'time'" 

I'm not sure why 'time' shows as String(13), I see that blank space, could that be a special character containing more than 1 hidden string? I did a trim() but it doesn't seem to change anything.

EDIT2:

Thanks everyone, below is the part of the code that I modified and it worked great:

$checkiftime = trim($pieces3[0], " '\t
\0\x0B");
if ($checkiftime == 'time')

Answer 1

I guess the main problem is that $value2 contained an unexpected value.

It simply looks like you need to sanitise the string, removing any characters that might get in the way of your check (such as space and apostrophe / single-quote). Try this...

$checkiftime = trim($pieces3[0], " '\t
\0\x0B");

See trim(). Demo here - http://ideone.com/uVEDXM

Alternatively, you could simply use a regular expression match to check the entire string, eg

if (preg_match('/^\W*time\W*: (\d+)$/', $value2, $matches)) {
    echo 'Yes!', PHP_EOL;
    var_dump($matches); // $matches[1] contains the numeric value 1376952971
}

Demo - http://ideone.com/025vAV