Use the implode () function to separate the array commas from the string ____ function

CheckBox submitted by an array, in order to insert the values in the array into the SQL statement execution, you need to separate the array's key values with commas:
Index.html
<form action= "2.php" method= "POST" >
<input name= "select[]" type= "checkbox" value= "1"/>1
<input name= "select[]" type= "checkbox" value= "2"/>2
<input name= "select[]" type= "checkbox" value= "3"/>3
<input type= "Submit" value= "Submie"/>
</form>
2.php
<?php
$array = $_post["select"];
$select = Implode (",", $array);
Echo $select;
?>
3 checkbox All Select Submit, the output result is: 1,2,3, you can insert directly into the SQL statement execution.
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