How to take the value of $_GET['sealed'] to leave the checkbox selected using PHP

Question

I have an array in PHP that are the values selected from the checkbox, which were obtained by $_GET:

$_GET['selecionados'] = array(2) { 
[0]=> string(1) "a" 
[1]=> string(1) "b"  
}

There I have the chekboxes:

foreach($selecoes = $check){
echo '<input type="checkbox" value="'.$check->valor.'" name="selecionados[]" id="'.$check->valor.'">
}

he prints:

<input type="checkbox" value="a" name="selecionados[]" id="a">
<input type="checkbox" value="b" name="selecionados[]" id="b">
<input type="checkbox" value="c" name="selecionados[]" id="c">
<input type="checkbox" value="d" name="selecionados[]" id="d">

I need that if the value of selected is in $_GET['selected'], it is marked "checked". in this example would be:

<input type="checkbox" value="a" name="selecionados[]" id="a" checked>
<input type="checkbox" value="b" name="selecionados[]" id="b" checked>
<input type="checkbox" value="c" name="selecionados[]" id="c">
<input type="checkbox" value="d" name="selecionados[]" id="d">

How to do it? I imagine using str_replace, but I don’t know exactly how.

Answer 1

You can inside the foreach that shows the checkbox, check if the value is in the $_GET['selected array], the code would look like this:

foreach($selecoes as $check){
  $checked = (in_array($check->valor, $_GET['selecionados']))?'checked':'';
  echo '<input type="checkbox" value="'.$check->valor.'" name="selecionados[]" id="'.$check->valor.'" '.$checked.'>';
}

The function in_array() checks if the value exists at the position of the array, so if it exists it marks as checked.