PHP crashes on echo - php

Question

I am debugging an open source PHP software (not a free one) for a client of mine.
It's a cashier software.
They have an issue with a document containing 748 lines.
When trying to display the document, PHP crashes and the user have to wait for the timeout.
It crashes on that echo (not the affichageUneLigne function, but really on the echo):
while ($r_sql = mysql_fetch_array($result)) {
echo affichageUneLigne($conn_mag, $r_sql, $typePRIX, $articleTEMPS, $clienDe, $caissier, $themeCAISSE, $provenance);
print '<div id="clearer"></div>';
$cptLIGNE++;
}
When I do that:
while ($r_sql = mysql_fetch_array($result)) {
if ($r_sql['DL_Ligne'] < 6360000){
echo affichageUneLigne($conn_mag, $r_sql, $typePRIX, $articleTEMPS, $clienDe, $caissier, $themeCAISSE, $provenance);
print '<div id="clearer"></div>';
$cptLIGNE++;
}
}
or that:
while ($r_sql = mysql_fetch_array($result)) {
if ($r_sql['DL_Ligne'] >= 6360000){
echo affichageUneLigne($conn_mag, $r_sql, $typePRIX, $articleTEMPS, $clienDe, $caissier, $themeCAISSE, $provenance);
print '<div id="clearer"></div>';
$cptLIGNE++;
}
}
It works. (Knowing that DL_Ligne is the line number with a step of 1000.)
I tought of a buffer length problem, but ob_flush before that line doesn't solve it, nor does it by increasing the memory_limit parameter.
PS: Do not ask me chy the developpers of this software have mixed echo and print, it's like that everywhere in the code...

Answer 1

What happens if you do something like this?
<?php
$outputArray = [];
while ($r_sql = mysql_fetch_array($result)) {
$outputArray[] = affichageUneLigne($conn_mag, $r_sql, $typePRIX, $articleTEMPS, $clienDe, $caissier, $themeCAISSE, $provenance);
$cptLIGNE++;
}
$outputString = implode('<div id="clearer"></div>', $outputArray);
echo $outputString . '<div id="clearer"></div>';