What’s missing with Switch Statement?

In below switch statement, it should have to print only "T","E","S" characters as string "testing" contains these words.
But it is printing all characters including "X" and "Z".
I can’t use "break;" because it will break operation after first case. (After matching "T" with word "testing") but I want to continue the operation even after every case to find the next character.

Please advice if anything is missing.

switch(true)
{
	case stristr('testing','t'):
	echo "T"."<br>";
	
	case stristr('testing','x'):
	echo "X"."<br>";
	
	case stristr('testing','e'):
	echo "E"."<br>";
	
	case stristr('testing','z'):
	echo "Z"."<br>";
	
	case stristr('testing','s'):
	echo "S"."<br>";
}

Code (markup):

 

What do you want to do ?

You have to check the return value of the function stristr , you didn't tell the case statement what is the expected result :

case (stristr('testing','t') = 'esting'):

PHP:

 

If you don't use a break, it'll fall through all cases after the first match. Use ifs instead.

 

if (stristr('testing','t')) {
echo "T"."<br>";
}

PHP:

You need to build 5 if statements using the above scheme

 

$subject = strtolower('testing'); // lowercase version of subject so we can use strpos below instead of stripos (php5 only)

$letters = str_split('txezs');
$found = array();
foreach ($letters as $letter)
{
	if (strpos($subject, $letter) !== false) // strpos is faster than stristr()
	{
		$found[] = strtoupper($letter);
	}
}
echo 'Found: ' . implode(', ', $found) . '<br />';

PHP:

 

Not sure why you're bothering with str_split()'ing a hardcoded string. I'd directly create an array with the letters.

 

Only for brevity. Either way is fine.