End Foreach after X number of records PHP - php

Question

I have the following query:
$trabajos = $con->query("SELECT * FROM portafolio ORDER BY RAND() LIMIT 4");
while ($po = $trabajos->fetch_array()) {
$trab[] = $po;
}
This query is working fine, but, it shows only 4 records, but then again in another part of the same page I need the same table information but I don't want it to be limited, say I want 10 instead of only 4. so.
Section Header
Section Slider <-- here only shows 4 items as intended
Using a foreach as follow:
foreach ($trab as $it) {
// My html Code
}
Section Mid Body some info
Section Main Body More info
Section Mid End Footer <-- here I need the same information as in the slider section but with a different layout instead of only 4 items I need 10 items.
For that last item I have to open another query similar as before.
$trabajos = $con->query("SELECT * FROM portafolio ORDER BY RAND() LIMIT 10");
while ($po = $trabajos->fetch_array()) {
$trab[] = $po;
}
So I was thinking is there a way to use:
$trabajos = $con->query("SELECT * FROM portafolio ORDER BY RAND()");
while ($po = $trabajos->fetch_array()) {
$trab[] = $po;
}
That query without the LIMIT and instead Limit the foreach to only fetch the first 4 rows or is there a way to use that query with the LIMIT but instead of 4 or 10, say I use 20, and for the first foreach only display the first 4 and for the second foreach show the rest after the first 4.
The main idea is not have more than 1 query for the same information.

Answer 1

this will exit a loop, but why not query 10 records, build your results, all 10 and then just output 4 of them, there and all 10 over yonder.
$x = 0;
foreach ($trab as $it) {
if($x == 5){
break; //will exit loop as will return.
}
// My html Code
++$x;
}
This will work with any kind of loop, you can also use continue to skip to the next pass of the loop
foreach ($trab as $it) {
if($x < 5){
continue; //code below here wont run until $x >= 5.
}
// My html Code
++$x;
}

Answer 2

i'm not sure to understand exactly what you want, but if you want to divide your array in 2 part. You can use a counter
$trabajos = $con->query("SELECT * FROM portafolio ORDER BY RAND() LIMIT 20");
$i = 0;
$trab2 = new Array();
while ($po = $trabajos->fetch_array()) {
if($i < 4) {
$trab[] = $po;
} else {
$trab2[] = $po;
}
$i++;
}

Answer 3

First, RAND() is horrible since it essentially disables MySQL’s built in caching with each run of the query. But there is no best way for me to advise how to get around that based on your script’s requirements. So just keep that in mind. But here is what I would recommend.
That query without the LIMIT and instead Limit the foreach to only
fetch the first 4 rows or is there a way to use that query with the
LIMIT but instead of 4 or 10, say I use 20, and for the first
foreach only display the first 4 and for the second foreach show
the rest after the first 4.
Yes, just use array_slice like this:
$trabajos = $con->query("SELECT * FROM portafolio ORDER BY RAND() LIMIT 20");
while ($po = $trabajos->fetch_array()) {
$trab[] = $po;
}
$trab_slice_1_size = 4;
$trab_slice_2_size = 10;
$trab_slice_1 = array_slice($trab, 0, $trab_slice_1_size);
$trab_slice_2 = array_slice($trab, $trab_slice_1_size, $trab_slice_2_size);
The nice thing about array_slice is you can cleanly select a start & end point. In my example I set the sizes in variables. Which makes it easier to adjust in your code if you somehow want to dynamically change values.

Answer 4

The easiest way is to use a counter variable:
function fetch_items($limit=10) {
public $trabajos,$trab;
$count=0;
$trabajos = $con->query("SELECT * FROM portafolio ORDER BY RAND()");
while (($po = $trabajos->fetch_array()) && ($count<$limit)) {
$count++;
$trab[] = $po;
}
}
If you call fetch_items() without a parameter, it defaults to 10 or less. If you specify a parameter it loads the array with up to the amount you specify. You could also have the function return the value of $count so you know how many were returned.

Answer 5

try;
$trabajos = $con->query("SELECT * FROM portafolio ORDER BY RAND() LIMIT 10");
$i = 0;
while ($i < 5 && $po = $trabajos->fetch_array()) {
.....
.....
$i++;
}
then, if you want to re-use the data,
mysql_data_seek($trabajos, 0);
$i = 0;
while ($i < 11 && $po = $trabajos->fetch_array()) {
.....
.....
$i++;
}