CodeIgniter 4 - How to use <?= $variable ?> syntax in an update form <select> to return-CodePudding

I noticed that in the CodeIgniter 4 documentation there are two types of echo's: <?php echo $variable; ?> and <?= $variable ?>. I particularly prefer the <?= $variable ?>.

I have an update form, where the fields use value="<?= $user_hunter['name_hunter'] ?>" to return the value, but a I don't know how it would work anymore using <?= ?>.

I would like to standardize this, I know the snippet below works, but I wanted to understand how the alternative works.


    <div >
        <div for="blood_type">blood_type:
                <select  name="blood_type" required>
                        <option value="" <?php if($user_hunter['blood_type']==''){echo 'selected';}?>>Choose the blood type </option>
                            <option value="A " <?php if($user_hunter['blood_type']=='A '){echo 'selected';}?>>A </option>
                            <option value="A-" <?php if($user_hunter['blood_type']=='A-'){echo 'selected';}?>>A-</option>
                            <option value="B " <?php if($user_hunter['blood_type']=='B '){echo 'selected';}?>>B </option>
                            <option value="B-" <?php if($user_hunter['blood_type']=='B-'){echo 'selected';}?>>B-</option>
                            <option value="AB " <?php if($user_hunter['blood_type']=='AB '){echo 'selected';}?>>AB </option>
                            <option value="AB-" <?php if($user_hunter['blood_type']=='AB-'){echo 'selected';}?>>AB-</option>
                            <option value="O "  <?php if($user_hunter['blood_type']=='O '){echo 'selected';}?>>O </option>
                            <option value="O-"  <?php if($user_hunter['blood_type']=='O-'){echo 'selected';}?>>O-</option>
                    </select>
            </div>
    </div>

CodePudding user response：

When you are using <?= ?>, you need to provide a echoable value. In your case you want to echo the result of an if condition. A ternary condition would be nice.

A ternary condition is like an if .. else but in a single line. You can search for Ternary Behaviour here

A solution with your data will be <?= $user_hunter['blood_type'] == 'A ' ? 'selected' : '' ?>. You can translate this condition by if the user blood type is A then echo selected else echo nothing