Warning: Wrong datatype for first argument in call to in_array() in

[jamesbond]

Does anyone know why I get this error when I try to run the code below?

I checked it over and over and can't find anything wrong with it...I"m guessing the foreach statement causes this error, but to my understanding the code is correct.


Warning: Wrong datatype for first argument in call to in_array() in .... line 13

<?

// Define arrays

$domains = array ("strawberries.com","bananas.com","apples.com");
$selected = array ("strawberries.com","bananas.com");



foreach ($domains as $domainlist) {


if (in_array ($selected, $domainlist)) {

echo"<A HREF=$PHP_SELF?delete=$domainlist>Delete $domainlist from list</A><br>";
}

else {
echo"<A HREF=$PHP_SELF?add=$domainlist>Add $domainlist to list</A><br>";
}

}

?>

[freakysid]

Aha, and so we meet again Mr. Bond

Yeah, you are passing two arrays to in_array() when you want to be passing $needle (as a string or int or double, etc) and $haystack (as an array) like so:

in_array($needle, $haystack);

I did not know of in_array() until this moment, so I just looked it up in the manual. That's why I like hanging around here - you learn something new every day

[jamesbond]

Thanks for the info freakysid,

Do you perhaps know of an efficient way of comparing 2 'haystacks', instead of comparing a 'needle' against a 'haystack' ?


By the way for the people who have "PHP Developer's Cookbook" , on page 85 they give an example on in_array :

$common = array ("Marriages","were","made","in","heaven");
$oscar_wilde = array ("Divorces","were","made","in","heaven");

$symdiff = array();

foreach ($common as $ele) {
if (!in_array ($oscar_wilde, $ele)) {
array_push ($symdiff, $ele);

}

}

...
.....

This gives the same error, since they use 2 arrays just like I did in my example.

[freakysid]

LOL, they just have the arguements around the wrong way. I think they mean to write this as:

$common = array ("Marriages","were","made","in","heaven"); 
$oscar_wilde = array ("Divorces","were","made","in","heaven"); 

$symdiff = array(); 

foreach ($common as $ele) { 
   if (!in_array ($ele, $oscar_wilde)) { 
      array_push ($symdiff, $ele); 
   } 
} 

Also, this statement:
array_push ($symdiff, $ele);
Is a rather extravagent way of writing:
$sysmdiff[] = $ele;
But each to there own

[jamesbond]

freakysid, thanks for clearing that up!