How to create a PHP function that contain a MySQL query? - php

Question

Hello at the moment I'm using a PHP file called select_Type.php that contain a MySQL query to create a <select></select> Box into HTML. I'm using include_once to link my admin.php and ./Includes/select_Type.php. I already created a file called ./Includes/functions.php where all my querys should be set in PHP functions.
I would like to learn more about functions.
Admin page admin.php where the <select></select> is :
<?php
session_start();
include_once './Includes/functions.php';
CheckLogIn('Superadmin');
SelectType();
//require_once './Includes/select_Type.php';
require_once './Includes/register.php';
?>
select_type.php :
<?php
require_once 'functions.php';
$querySQL = "SELECT * FROM tbltype";
$queryResult = GetQuery($querySQL);
while ($row = mysqli_fetch_assoc($queryResult)){
$dataArrayType[] = $row;
}
?>
What I tried:
<?php
function SelectType() {
GLOBAL $_POST;
$querySQL = "SELECT * FROM tblType";
$queryResult=GetQuery($querySQL);
while ($row = mysqli_fetch_assoc($queryResult)) {
$dataArrayType[] = $row;
}
}
?>
What am I doing wrong ?
Thanks in advance :)

Answer 1

Thank you all especially Déjà vu !!!!!
You were all very helpfull.
The problem was, how most of you told me: I didn't returned the value.
Before:
<?php
function SelectType() {
GLOBAL $_POST;
$querySQL = "SELECT * FROM tblType";
$queryResult=GetQuery($querySQL);
while ($row = mysqli_fetch_assoc($queryResult)) {
$dataArrayType[] = $row;
}
}
?>
Now:
I deleted the GLOBAL $_POST becauce $_POST is already GLOBAL.(Thanks to ɴ ᴀ ᴛ ʜ)
<?php
function SelectType() {
$querySQL = "SELECT * FROM tblType";
$queryResult=GetQuery($querySQL);
while ($row = mysqli_fetch_assoc($queryResult)) {
$dataArrayType[] = $row;
}
return $dataArrayType;
}
?>
admin.php
I put my function SelectType() in my foreach. Et voila!
<select type="text" id="register_type" name="register_type" required>
<?php
foreach (SelectType() as $row) {
echo "<option value='" . $row['idType'] . "'>" . $row['dtType'] . '</option>';
}
?>
</select>

Answer 2

You can use this:
function sel($table,$field="*", $condition="1",$sort="" ){
if($sort!='') $sort="order by $sort ";
//echo "select $field from $table where $condition $sort ";
$sel_query=mysql_query("select $field from $table where $condition $sort ");
//$sel_result=array();
while($temp_res=#mysql_fetch_array($sel_query))
{
$sel_result[]=$temp_res;
}
return isset($sel_result)?$sel_result: 0;
}
And get result:
$temp_res=sel("post","*"," userid ='".$frnd['friend']."' ORDER BY id DESC");
if($temp_res)foreach($temp_res as $row){
echo $row['content'];
}