php echo data to html performance - php

Question

I add some Data in form of a table to my website. Actually everything works but i wanted to test the performance for some big data. It was very bad. Here my Results:
tablesize | time
-----------------
10x20 | 0.22s
100x20 | 3.29s
1000x20 | 28.75s
My question is which way is better to show the results and why:
1:
<?php
for($i=0; $i<count($array); $i++){
echo "<div id='...' class='...Ä style='...'>"
for($i=0; $i<count($array); $i++){
echo "<div style='...'>".array[$i][$j]."</div>";
}
echo "</div>";
}
?>
2:
<?php
for($i=0; $i<count($array); $i++){
?>
<div id='...' class='...Ä style='...'>
<?php
for($i=0; $i<count($array); $i++){
?>
<div style='...'> <?php echo array[$i][$j]; ?> </div>
<?php } ?>
</div>
<?php } ?>
Maybe someone has some additional tips how i can make the data visualization fast. I read some artical about MySQL structure and i believe my DB looks fine. So what i can do to optimize the reading of data.

Answer 1

As scaisEdge said, paginate your data.
Moreover, there are several changes that can make your code faster.
count($foo) outside of for loop
use pre-increment instead of post
use 'str' and concatenation instead of "str"
Here is a "benchmark" (without output) :
<?php
$array = array();
for($i = 0; $i < 1000; ++$i){
$array[] = range(0, 20, 1);
}
$t = microtime(true);
for($k = 0; $k < 5000; ++$k){
for($i=0; $i<count($array); $i++){
$a = "<div id='...' class='...Ä style='...'>";
for($j=0; $j<count($array[$i]); $j++){
$a = "<div style='...'>".$array[$i][$j]."</div>";
}
$a = "</div>";
}
}
echo 'Count and post : ' . (microtime(true) - $t) . "\n";
$t = microtime(true);
for($k = 0; $k < 5000; ++$k){
$c = count($array);
for($i=0; $i<$c; $i++){
$a = "<div id='...' class='...Ä style='...'>";
$c2 = count($array[$i]);
for($j=0; $j<$c2; $j++){
$a = "<div style='...'>".$array[$i][$j]."</div>";
}
$a = "</div>";
}
}
echo 'No count and post : ' . (microtime(true) - $t) . "\n";
$t = microtime(true);
for($k = 0; $k < 5000; ++$k){
$c = count($array);
for($i=0; $i<$c; ++$i){
$a = "<div id='...' class='...Ä style='...'>";
$c2 = count($array[$i]);
for($j=0; $j<$c2; ++$j){
$a = "<div style='...'>".$array[$i][$j]."</div>";
}
$a = "</div>";
}
}
echo 'No count and pre : ' . (microtime(true) - $t) . "\n";
$t = microtime(true);
for($k = 0; $k < 5000; ++$k){
$c = count($array);
for($i=0; $i<$c; ++$i){
$a = '<div id="..." class="...Ä style="...">';
$c2 = count($array[$i]);
for($j=0; $j<$c2; ++$j){
$a = '<div style="...">'.$array[$i][$j].'</div>';
}
$a = '</div>';
}
}
echo 'No count and pre and \' : ' . (microtime(true) - $t) . "\n";
// #scaisEdge
$t = microtime(true);
for($k = 0; $k < 5000; ++$k){
foreach($array as $subarray){
$a = '<div id="..." class="...Ä style="...">';
foreach($subarray as $v){
$a = '<div style="...">'.$v.'</div>';
}
$a = '</div>';
}
}
echo 'Foreach : ' . (microtime(true) - $t) . "\n";
?>
This outputs :
Count and post : 46.050459861755
No count and post : 30.590306043625
No count and pre : 29.880299091339
No count and pre and ' : 29.930299043655
Foreach : 29.120290994644
As weird as it looks, ' seems to be slower than ".
PHP checks " strings variables inside and replace it whereas ' string are just... string. No operation performed.
Has someone an idea of this slowness ?

Answer 2

For large output you should use pagination ... output 1000 rows seems not useful
If you paginate your result is more equal to the firts that to the last .
But you can do somethings for the code .. you should count the result just one time and not for all cycle of the loop
so instead of for($i=0; i<count($array); $i++){
you should use
$numElem =count($array);
for($i=0; $i<$numElem; $i++){
.......
}
or use
foreach ( $array as $key => $value ){
......
}
these are much faster