Echo return mulitiple variables - php

Question

I have a problem with an mysql query, I need to extract all data from my table and use him as another sql query.
This is the code I am using:
<?php
function toateMhz() {
require ('SQL.php');
$sql = "SELECT DISTINCT(performanta_cpu) FROM modele ORDER BY CAST(performanta_cpu AS UNSIGNED) DESC";
foreach ($dbh->query($sql) as $linie)
{
$mhz[] = $linie['performanta_cpu'];
}
if(isset($mhz['1']))
{
$mhz1 = "$mhz[0] OR ";
}
else $mhz['0'];
if(isset($mhz['2']))
{
$mhz2 = "$mhz[1] OR ";
}
else $mhz['1'];
if(isset($mhz['3']))
{
$mhz3 = "$mhz[2] OR ";
}
else $mhz['2'];
if(isset($mhz['4']))
{
$mhz4 = "$mhz[3] OR ";
}
else $mhz['3'];
if(isset($mhz['5']))
{
$mhz5 = "$mhz[4] OR ";
}
else $mhz['4'];
if(isset($mhz['6']))
{
$mhz6 = "$mhz[5] OR ";
}
else $mhz['5'];
if(isset($mhz['7']))
{
$mhz7 = "$mhz[6] OR ";
}
else $mhz['6'];
if(isset($mhz['8']))
{
$mhz8 = "$mhz[7] OR ";
}
else $mhz['7'];
if(isset($mhz['9']))
{
$mhz9 = "$mhz[8] OR ";
}
else $mhz['8'];
if(isset($mhz['10']))
{
$mhz10 = "$mhz[9] OR ";
}
else $mhz['9'];
if(isset($mhz['11']))
{
$mhz11 = "$mhz[10] OR ";
}
else $mhz['10'];
if(isset($mhz['12']))
{
$mhz12 = "$mhz[11] OR ";
}
else $mhz['11'];
if(isset($mhz['13']))
{
$mhz13 = "$mhz[12] OR ";
}
else $mhz['12'];
if(isset($mhz['14']))
{
$mhz14 = "$mhz[13] OR ";
}
else $mhz['13'];
if(isset($mhz['15']))
{
$mhz14 = "$mhz[14] OR ";
}
else $mhz['14'];
$frecvente = "$mhz1 $mhz2 $mhz3 $mhz4 $mhz5 $mhz6 $mhz7 $mhz8 $mhz9 $mhz10 $mhz11 $mhz12 $mhz13 $mhz14";
return $frecvente;
}
echo toateMhz();
?>
And this is the result from code:
2000 OR 1600 OR 1500 OR 1400 OR 1000 OR 800 OR
But the correct result is 2000 OR 1600 OR 1500 OR 1400 OR 1000 OR 800 OR 200
Last word must not be OR

Answer 1

Not quite sure but this might do the trick
foreach ($dbh->query($sql) as $linie) {
// append value of this record to the array $mhz
$mhz[] = $linie['performanta_cpu'];
}
// return the concatenation of all elements in $mhz with ' OR ' as "glue" between elements
return join(' OR ', $mhz);
join($s, $arr) is an alias of implode($s, $arr) which concatenates all (string) elements of the given array $arr and putting $s "between" the elements. E.g.
$x = array('a','b', 'c');
echo join(' - ', $x);
prints a - b - c

Answer 2

Use implode to join your array values into a string :
function toateMhz() {
require ('SQL.php');
$sql = "SELECT DISTINCT(performanta_cpu) FROM modele ORDER BY CAST(performanta_cpu AS UNSIGNED) DESC";
foreach ($dbh->query($sql) as $linie)
{
$mhz[] = $linie['performanta_cpu'];
}
return implode(" OR ", $mzh);
}
echo toateMhz();