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    <p>Ok - I've just spent an hour on this - and I've worked out the problem + solution</p> <p>The issue is that when the variable you are testing is part of an array, CI interprets the field as being set, and thus "contains" a value (even when it is empty). Because that "value" is NOT a number greater than 0 - it fails.</p> <p>Therefore you'll need to unset the $_POST (NOT $user_group_profiles) variable when it is "empty" so that it passes validation. Note - validation is run on $_POST - that is why you are unsetting $_POST and not $user_group_profiles</p> <p>So the workaround is this:</p> <pre><code>$user_group_profiles = $this-&gt;input-&gt;post('user_group_profiles', TRUE); foreach ($user_group_profiles as $key =&gt; $user_group_profile) { // Set the rules $this-&gt;form_validation-&gt;set_rules($key."[profile_name]", "Profile Name", "trim|required"); $this-&gt;form_validation-&gt;set_rules($key."[birthdate]", "Birthdate", "trim|required"); $this-&gt;form_validation-&gt;set_rules($key."[height]", "Height", "trim|greater_than[0]"); $this-&gt;form_validation-&gt;set_rules($key."[weight]", "Weight", "trim|greater_than[0]"); // Now check if the field is actually empty if (empty($user_group_profile['height'])) { // If empty, remove from array so CI validation doesnt get tricked and fail unset($_POST[$key]['height']); } if (empty($user_group_profile['weight'])) { unset($_POST[$key]['weight']); } } </code></pre> <p>I've tested this - and it fixes your problem.</p> <p>You could also program it this way if you dont want to touch the $_POST data:</p> <pre><code>foreach ($user_group_profiles as $key =&gt; $user_group_profile) { // Set the rules $this-&gt;form_validation-&gt;set_rules($key."[profile_name]", "Profile Name", "trim|required"); $this-&gt;form_validation-&gt;set_rules($key."[birthdate]", "Birthdate", "trim|required"); // Now check if the field is actually empty if ( ! empty($user_group_profile['height'])) { $this-&gt;form_validation-&gt;set_rules($key."[height]", "Height", "trim|greater_than[0]"); } if ( ! empty($user_group_profile['weight'])) { $this-&gt;form_validation-&gt;set_rules($key."[weight]", "Weight", "trim|greater_than[0]"); } } </code></pre>
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    1. COGreat job! Thanks, it worked!
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