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<?php $sel_subject['visible']=0;?> <input type="radio" name="visible" value="1" checked=<?=$sel_subject['visible'] == 1?checked:''?>>
Output for 5.4.0 - 7.1.7
<input type="radio" name="visible" value="1" checked=>
Output for 4.3.0 - 5.3.29
<input type="radio" name="visible" value="1" checked=<?=$sel_subject['visible'] == 1?checked:''?>>