comparing elements of two one-dimensional arrays

Question

There are 2 arrays: an array with groups for fields Array ([0] => Array ([id] => 2 [title] => Cars [description] => Fields with characteristics for cars))

[1] => Array ( [id] => 3 [title] => Недвижимость [description] => Группа для полей к объявлениям о недвижимости ) )

and an array for connecting fields that belong to these groups: Array ([0] => Array ([id] => 32 [id_field] => 12 [id_fieldsgroup] => 2)

 [1] => Array ( [id] => 33 [id_field] => 12 [id_fieldsgroup] => 3 ) )

How can you compare these two arrays so that when the elements match, all for which $ fgl ['id'] == $ fgff ['id_fieldsgroup'] were selected, I tried to do this, but this is not true:

 <div class="col-xs-12"> <select name="id_group[]" multiple="true" id="id_group" class="form-control col-xs-12"> <?php if(!empty($FieldsGroupList)):?> <?php foreach($FieldsGroupList as $fgl): ?> <?php foreach ($getFieldsGroupForField as $fgff): ?> <?php if ($fgl['id'] == $fgff['id_fieldsgroup']): ?> <option value="<?=$fgl['id']?>" selected><?=$fgl['title']?> - <?=$fgl['description']?></option> <?php endif ?> <?php endforeach ?> <?php endforeach ?> <?php else: ?> <option value="0">Нужно создать группы!</option> <?php endif ?> </select> </div>

with this code, they are allocated only for which the condition coincided, the rest are not displayed at all, how to fix it ??

I want to build a select list with multiple choices so that those <option> for which $ fgl ['id'] == $ fgff ['id_fieldsgroup'] have
Well, you make sure that the option tag is not created, but only the selected class is set.

Nikolaj Sarry Nikolaj Sarry 1.236 ten sixteen · Accepted Answer · 2018-06-04T22:37:13

In order for the rest of the options to be displayed, and the necessary ones should only be selected , the condition should be hung up to display the selected class, and not to draw the tag.

Instead:

 <?php if ($fgl['id'] == $fgff['id_fieldsgroup']): ?> <option value="<?=$fgl['id']?>" selected><?=$fgl['title']?> - <?=$fgl['description']?></option> <?php endif ?>

Need to:

 <option value="<?=$fgl['id']?>" <?= ($fgl['id'] == $fgff['id_fieldsgroup']) ? 'selected' : '' ?>><?=$fgl['title']?> - <?=$fgl['description']?></option>

Or so:

 <?php if ($fgl['id'] == $fgff['id_fieldsgroup']): ?> $selected = 'selected'; <?php endif ?> <option value="<?=$fgl['id']?>" <?= $selected ?>><?=$fgl['title']?> - <?=$fgl['description']?></option>

If the prescription attribute is selected, then it is not clear why.
If you want to rewrite everything to js, then take it and start rewriting.

comparing elements of two one-dimensional arrays

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