I want to learn how to use recursive functions, so I started to create one:
<?php
$tableau = [[[[2],[2]],[[2],[2]]],[[[2],[2]],[[2],[2]]]];
function test_count_recursive($tab, $compte = 0){
foreach($tab as $ss_tab){
if(!is_array($ss_tab)){
$compte += 1;
}
else{
test_count_recursive($ss_tab, $compte);
}
}
return $compte;
}
echo test_count_recursive($tableau);
But it doesn't work, can you tell me why?
Generally, you pass a piece of data up the recursive call tree or down, not both. In this case, you don't need to pass parent values down. Just return the count and let the parent node accumulate it:
<?php
function test_count_recursive($tab /* one param only */) {
$compte = 0; // <-- store the local total for this node
foreach ($tab as $ss_tab) {
if (is_array($ss_tab)) {
$compte += test_count_recursive($ss_tab /* one param only */);
// ^^^^^^^ accumulate total from children
}
else {
$compte++;
}
}
return $compte;
}
$tableau = [[[[2],[2]],[[2],[2]]],[[[2],[2]],[[2],[2]]]];
echo test_count_recursive($tableau); // => 8