column_width_classes.php

<?php
/**
 * Given an array of members looks for $width_param and tries to figure out the columns widths for all members
 * will return equal parts if all members do not have $width_param set
 * will fill in the blank if one is set and another is not
 * returns false if $members is not an array or is empty
 *
 * @param [array] $members
 * @param [string] $breakpoint
 * @param [string] $width_param
 * @return [array] $members
 */
function column_width_classes( $members, $breakpoint, $width_param = 'column_width' ){

    if( !is_array( $members ) || empty( $members ) ){
        return false;
    }

    $widths_array = array();
    $count = count( $members );
    $class_prefix = 'col-' . $breakpoint . '-';

    //get all the $width_params into $widths_array
    for( $i = 0; $i < $count; $i++ ){
        $widths_array[$i] = $members[$i][$width_param];
    }

    //get the sum of all widths
    $sum = array_sum( $widths_array );

    //see if both values are set
    $set_values = array();
    $all_set = true;

    //determin if all are set
    for( $i = 0; $i < $count; $i++ ){
        if( "" === $members[$i][$width_param] ){
            $set_values[$i] = 'false';
            $all_set = false;
        } else {
            $set_values[$i] = 'true';
        }
    }

    //error_log( 'sum=' . $sum );
    //determin what the classes will be
    if( 0 === $sum ){ //no widths have been set
        
        $common_width = floor( 12/$count );
        $common_class =  $class_prefix . $common_width;

        for( $i = 0; $i < $count; $i++ ){
            $members[$i][$width_param] = $common_class;
        }
    } elseif( 0 < $sum && 12 > $sum ){ //sum is not 12
        
        if( $all_set ){ //both are set
            for( $i = 0; $i < $count; $i++ ){
                $members[$i][$width_param] = $class_prefix . $members[$i][$width_param];
            }
        } else { //not all of them are set, set the blank ones equally
            
            $freqency = array_count_values( $set_values );
            $common_width = ( floor( 12/$freqency['false'] ) ) - $sum;

            for( $i = 0; $i < $count; $i++ ){
                if( 'false' === $set_values[$i] ){
                    $members[$i][$width_param] = $class_prefix . $common_width;
                } elseif( 'true' === $set_values[$i] ){
                    $members[$i][$width_param] = $class_prefix . $members[$i][$width_param];
                }
            }
        }

    } elseif( 12 == $sum ){ //the whole grid has been used
        //just add the classes
        for( $i = 0; $i < $count; $i++ ){
            $members[$i][$width_param] = $class_prefix . $members[$i][$width_param];
        }
    } else { //failed all above
        //set the classes to what the user set it as so they can see that it broke
        for( $i = 0; $i < $count; $i++ ){
            $members[$i][$width_param] = $class_prefix . $members[$i][$width_param];
        }
    }
   
    //error_log( var_export( $members, true ));
    return $members;
}