Вот как ни странно, оба варианта занимают равный объём памяти
вариант 1 (+/-)
<?php
$source = array(
0 => array('a' => 'a10',
'b' => 'a20',
'c' => 'cccc30',
'd' => 'a40',
'e' => 'a50'),
1 => array('a' => 'b10',
'b' => 'b20',
'c' => 'b30',
'd' => 'b40',
'e' => 'b50'),
2 => array('a' => 'c10',
'b' => 'c20',
'c' => 'cccc30',
'd' => 'c40',
'e' => 'c50')
);
function counting($arr = array()) {
$sum = 0;
foreach ($arr as $val) $sum++;
return $sum;
}
counting($source);
echo memory_get_usage();вариант 2 (+/-)
<?php
$source = array(
0 => array('a' => 'a10',
'b' => 'a20',
'c' => 'cccc30',
'd' => 'a40',
'e' => 'a50'),
1 => array('a' => 'b10',
'b' => 'b20',
'c' => 'b30',
'd' => 'b40',
'e' => 'b50'),
2 => array('a' => 'c10',
'b' => 'c20',
'c' => 'cccc30',
'd' => 'c40',
'e' => 'c50')
);
function counting($arr = array()) {
$sum = 0;
while (each($arr)) $sum++;
return $sum;
}
counting($source);
echo memory_get_usage();