Basically I'm checking days of the week from an array to a string based on an initialization of the day for instance:
<?php
$check_days = array("M", "T");
$days1 = "MTW";
$days2 = "M";
[insert code to compare $check_days to $days1 and $days2 so that $days1 returns FALSE while $days2 returns TRUE]
?>
Try using a regex character class and implode:
if (preg_match('/^['.implode($check_days).']+$/', $days1)) {
// do some stuff
}
EDIT: Let me help explain what's going on here:
implode($check_days)
This combines all the elements of an array into a single string. In your case, this is "MT".
preg_match('/^[MT]+$/', $days1);
This is a regular expression that checks that after the 'beginning' (^), $days1 contains either an "M" or a "T" ([MT]), repeated one or more times (+), then the string ends ($). It returns true if this is the case.
Hope that helps.
'MMMMMWWWWTTTT', as well.
Sorry, I read your question wrong, and so my answer is wrong too. I'd go with wavemode's solution.
Original answer
If I understand your requirements correctly, you want to make sure all the days in check_days must exist in the variable to be tested. If I'm correct, this function will work:
function checkDays($haystack, $validator) {
$ok = true;
foreach ($validator as $day) {
$ok = (strpos($haystack, $day) !== false) && $ok;
}
return $ok;
}
See it in action in this phiddle: http://phiddle.net/6
Try this:
function checkDays($testFor, $inString){
$a = str_split($inString); $d = array();
foreach($a as $v){
if(!in_array($testFor, $v) || in_array($d, $v)){
return false;
}
$d[] = $v;
}
return true;
}
$check_days = array('M', 'T');
echo checkDays($check_days, 'MTW');
echo checkDays($checkdays, 'M');