Read a file with Phpexcel, how to tell if the contents of a field are not duplicated

Read the file with Phpexcel, how to tell if the content of a field is not duplicated? After reading, I want to display duplicate content, no duplicates are not displayed.

How can I tell if the contents of the read have been duplicated?

Reply to discussion (solution)

I think I need to save the data in an array and use various array functions.

Loop Excel data, you will need to compare the value of the repeating field, write to the temporary array, if the temporary array exists, give that row of data column, color, the landlord is the need for such a function bar.
$temparr = Array ();
foreach ($all _excel as $key = + $value) {
if (In_array ($temparr, $value [' name '])) {
Set a column color
}else{
Writes the name value to $temparr
}
}

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