Two algorithm codes for sorting arrays in PHP without built-in functions_PHP tutorial

A friend encountered a test question when he was looking for a job. Please make a note.
It is very likely that I will encounter it in the future.
Problem: PHP does not use built-in functions to sort arrays, it may be in descending order or ascending order
The first method: the legendary bubbling method

Copy code The code is as follows:

function arraysort($data, $order = 'asc') {
//asc ascending desc descending
$temp = array ();
$count = count ( $data );
if ($count <= 0)
return false; //The data passed in is incorrect
if ($order == 'asc') {
for($i = 0; $i < $count; $i ++) {
for($j = $count - 1; $j > $i; $j --) {
if ($data [$j] < $data [$j - 1]) {
//Exchange the positions of the two data
$temp = $data [$j];
$data [$j] = $data [$j - 1];
$data [$j - 1] = $temp;
}
}
}
} else {
for($i = 0; $i < $count; $i ++) {
for($j = $count - 1; $j > $i; $j --) {
if ($data [$j] > $data [$j - 1]) {
$temp = $data [$j];
$data [$j] = $data [$j - 1] ;
$data [$j - 1] = $temp;
}
}
}
}
return $data;
}
$data = array (7, 5, 3, 8, 9, 1, 5, 3, 1, 24, 3, 87, 0, 33, 1, 12, 34, 54, 66, 32);
var_dump ( arraysort ( $ data ) ); //Ascending order
echo ('
');
var_dump ( arraysort ( $data ,'desc') ); // Descending order

Second This method: I don’t know what to call it, so let’s call it the insertion method!囧

Copy code The code is as follows:

function arraysort3($data, $order = 'asc') {
//Currently only sorting in ascending order
$count = count ( $data );
for($i = 1; $i < $count; $i ++) {
$temp = $data [$i];
$j = $i - 1;
while ( $data [$j] > $temp ) {
$data [$j + 1] = $data [$j ];
$data [$j] = $temp;
$j --;//Why decrement: judge bit by bit from the high bit
}
}
return $data;
}
$data = array (7, 5, 3, 8, 9, 1, 5, 3, 1, 24, 3, 87, 0, 33, 1, 12, 34, 54, 66, 32 );
var_dump ( arraysort3 ( $data ) ); //Ascending order

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