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PHP quick sort problem

WBOY
WBOYOriginal
2016-09-27 14:18:061113browse

As shown in the picture: PHP quick method, two writing methods in the loop, the above one is OK, the following one will report errors;

PHP quick sort problem

Error screenshot:

PHP quick sort problem

Reply content:

As shown in the picture: PHP quick method, two writing methods in the loop, the above one is OK, the following one will report errors;

PHP quick sort problem

Error screenshot:

PHP quick sort problem

Did you think

<code>if ($v > $mid) {
    $rightArr[] = $v;
}
if ($v < $mid) {
    $leftArr[] = $v;
}</code>

and

<code>if ($v < $mid) {
    $leftArr[] = $v;
} else {
    $rightArr[] = $v;
}</code>

Does it mean the same thing?

Don’t you consider the situation where $v == $mid?

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