我正在尝试制作一个包含100个索引的数组的直方图，其中允许重复数字。我需要另一个数组$estastisticas（），它告诉数组$histogram（）中存在n的次数。例如
我有这个：$直方图（1,1,1,2,1,2,3,2,2）我想要这个：$estastisticas（0,4,4,1）
换句话说，
数组$histogram，数字0（或$estastisticas（0））出现0次，数字1（或$destesticas（1。
这是我的代码，但当我制作var_dump（$estatisticcas）时；在代码的末尾（或代码的任何其他部分），我得到这个错误消息数组（大小=0）空
为什么数组$estastisticas是空的？我做错了什么？感谢您抽出时间
<?php
//vars
$histogram = array();
$estatisticas = array();
$num = 0;
$count = 0;
//connection do database
include('connect_db.php'); etc... everything fine here
//insert into array $histogram() values from database... everything fine here
while($row = mysqli_fetch_array($fetch)){
array_push($histogram,
$row['primeiro_numero'], //table names... everything fine here
$row['segundo_numero'], //table names... everything fine here
$row['terceiro_numero'], //table names... everything fine here
$row['quarto_numero'], //table names... everything fine here
$row['quinto_numero']); //table names... everything fine here
}
//conversion from array $histogram() STRING into INT... everything fine here
//final result is $histogram() is all in INT... everything fine here
for( $i = 0; $i < count($histogram); $i++){
$histogram[$i] = (int) $histogram[$i];
}
for ($i = 0; $i <= 50; $i++) {
$num = 0;
$count = 0;
do {
if ($histogram[$i] = $count) {
$num = $histogram[$i];
$estatisticas[$num]++;
}
else {
$count = $count+1;
}
} while ($histogram[$i] != $num);//end while
}//end for
//PROBLEM HERE
var_dump($estatisticas); //error message "array (size=0) empty"
?>
你的$estatisticas没有正确安装，我对你的代码做了一些修改，希望这对有帮助
<?php
//vars
$histogram = array();
$estatisticas = array();
$num = 0;
$count = 0;
//connection do database
include('connect_db.php'); etc... everything fine here
//insert into array $histogram() values from database... everything fine here
while($row = mysqli_fetch_array($fetch)){
array_push($histogram,
$row['primeiro_numero'], //table names... everything fine here
$row['segundo_numero'], //table names... everything fine here
$row['terceiro_numero'], //table names... everything fine here
$row['quarto_numero'], //table names... everything fine here
$row['quinto_numero']); //table names... everything fine here
}
//conversion from array $histogram() STRING into INT... everything fine here
//final result is $histogram() is all in INT... everything fine here
for( $i = 0; $i < count($histogram); $i++){
$histogram[$i] = (int) $histogram[$i];
}
for ($i = 0; $i <= 50; $i++) {
$num = 0;
$count = 0;
do {
if ($histogram[$i] = $count) {
$num = $histogram[$i];
(is_null($estatisticas[$num]) || empty($estatisticas[$num])) ? $estatisticas[$num] = 1 : $estatisticas[$num]++;
}
else {
$count = $count+1;
}
} while ($histogram[$i] != $num);//end while
}//end for
//PROBLEM HERE
var_dump($estatisticas); //error message "array (size=0) empty"
?>
我会这样做：
$estatisticas = array_count_values($histogram);
for($i=0;$i<100;$i++) {
if(!isset($estatisticas[$i])) {
$estatisticas[$i] = 0;
}
}