PHP - Get and compare row value from a different column for the same row

Question

I'm attempting to edit a custom function and struggling to get the row value for a particular custom column ('rank_td') to compare against its other columns (rank_lw and rank_lm), all inside a HTML table.

Tried a fair few variations and can't get it going.

Any ideas?

function custom_value($cellValue, $dataColumnHeader, $rank_td_value) {

if($dataColumnHeader == "rank_lw" || $dataColumnHeader == 'rank_lm'){

    $row['rank_td']->$cellValue = $rank_td_value;

    if($rank_td_value == $cellValue){
                $styleColor = 'color:blue;';
             }else if($rank_td_value < $cellValue){ 
                $styleColor = 'color:green;';
             }else{
                $styleColor = 'color:red;';
             } 
        return $class_name.'<span style="'.$styleColor.'">'.$cellValue.'</span>';
}

return $cellValue; }

Answer 1

You are not calling the global variable $row which exists outside the scope of this function - hence my comment that it doesn't look like it belongs here. If you want to be able to access a variable from outside a function you need to either pass that variable in, or declare it using the global keyword. Here is a very basic example of this:

$row['some_value'] = "value1";

function scopeTest($var1) {
    $row['some_value'] = $var1;//local variable $row created
}
function scopeTestTwo($var1) {
    global $row;//variable outside the function
    $row['some_value'] = $var1;
}

scopeTest("jam");
print_r($row);//Array ( [some_value] => value1 )
scopeTestTwo("jam");
print_r($row);//Array ( [some_value] => jam )

in your code you also have this

return $class_name.'<span....

but $classname is not defined so either it is redundant and you should remove it (because this will cause a php notice and anyway redundant code is, well, redundant) or it should be defined somewhere which means something has been missed out