如何在CakePHP中打印唯一值的计数

Question

我试图返回每个$ models ['location']中有多少个值的计数。我已经拿出下面的代码来做到这一点，它的工作原理，问题是第一个计数返回0.

下面是一个输出示例：0in7B 27in7C 40in8A 36in8B 40in8C。现在这几乎是正确的，但真的有27in7B 40in7C 36in8A等等。有没有人知道我在这里做错了什么或更好的方式来做到这一点？

<?php 
    $locations = array(); 
    foreach($subcategory['Product'] as $models) { 
     if (in_array($models['location'], $locations)) { 
      $i++; 
      continue; 
     } 
     $locations[] = $models['location']; 
     echo $i . "in" . $models['location'] . " "; 
     $i = 1; 
    } 
?> 

的var_dump（$模式[ '位置']）返回：

string(2) "7B" 0in7B string(2) "7B" string(2) "7B" string(2) "7B" string(2) "7B" string(2) "7B" string(2) "7B" string(2) "7B" string(2) "7B" string(2) "7B" string(2) "7B" string(2) "7B" string(2) "7B" string(2) "7B" string(2) "7B" string(2) "7B" string(2) "7B" string(2) "7B" string(2) "7B" string(2) "7B" string(2) "7B" string(2) "7B" string(2) "7B" string(2) "7B" string(2) "7B" string(2) "7B" string(2) "7B" string(2) "7C" 27in7C string(2) "7C" string(2) "7C" string(2) "7C" string(2) "7C" string(2) "7C" string(2) "7C" string(2) "7C" string(2) "7C" string(2) "7C" string(2) "7C" string(2) "7C" string(2) "7C" string(2) "7C" string(2) "7C" string(2) "7C" string(2) "7C" string(2) "7C" string(2) "7C" string(2) "7C" string(2) "7C" string(2) "7C" string(2) "7C" string(2) "7C" string(2) "7C" string(2) "7C" string(2) "7C" string(2) "7C" string(2) "7C" string(2) "7C" string(2) "7C" string(2) "7C" string(2) "7C" string(2) "7C" string(2) "7C" string(2) "7C" string(2) "7C" string(2) "7C" string(2) "7C" string(2) "7C" string(2) "8A" 40in8A string(2) "8A" string(2) "8A" string(2) "8A" string(2) "8A" string(2) "8A" string(2) "8A" string(2) "8A" string(2) "8A" string(2) "8A" string(2) "8A" string(2) "8A" string(2) "8A" string(2) "8A" string(2) "8A" string(2) "8A" string(2) "8A" string(2) "8A" string(2) "8A" string(2) "8A" string(2) "8A" string(2) "8A" string(2) "8A" string(2) "8A" string(2) "8A" string(2) "8A" string(2) "8A" string(2) "8A" string(2) "8A" string(2) "8A" string(2) "8A" string(2) "8A" string(2) "8A" string(2) "8A" string(2) "8A" string(2) "8A" string(2) "8B" 36in8B string(2) "8B" string(2) "8B" string(2) "8B" string(2) "8B" string(2) "8B" string(2) "8B" string(2) "8B" string(2) "8B" string(2) "8B" string(2) "8B" string(2) "8B" string(2) "8B" string(2) "8B" string(2) "8B" string(2) "8B" string(2) "8B" string(2) "8B" string(2) "8B" string(2) "8B" string(2) "8B" string(2) "8B" string(2) "8B" string(2) "8B" string(2) "8B" string(2) "8B" string(2) "8B" string(2) "8B" string(2) "8B" string(2) "8B" string(2) "8B" string(2) "8B" string(2) "8B" string(2) "8B" string(2) "8B" string(2) "8B" string(2) "8B" string(2) "8B" string(2) "8B" string(2) "8B" string(2) "8C" 40in8C string(2) "8C" string(2) "8C" string(2) "8C" string(2) "8C" string(2) "8C" string(2) "8C" 

Answer 1

编辑：这种解决方案有点不同于你的，但它的工作原理，我已经测试了它。

请注意，“算法”保留O（N）。即使你必须做第二个foreach来检查数组，第二个包含的元素少于N个元素，因此它保持N型。

$locations = array(); 
foreach($subcategory['Product'] as $models) { 
    if(isset($locations[$models['location']])){ 
     $locations[$models['location']] += 1; 
    } else { 
     $locations[$models['location']] = 1; 
    } 
} 

您将得到一个包含所有计数的数组。你只需要打印它。

它可能看起来很奇怪，但非常简单。你遍历数组并检查一个条目是否已经存在。如果是，则在该位置增加值，否则将值初始化为1.

该数组将具有位置字符串作为键。

---

你也可以做它作为一个短期，如果：回波

$locations = array(); 
foreach($subcategory['Product'] as $models) { 
    isset($locations[$models['location']]) ? $locations[$models['location']] += 1 : $locations[$models['location']] = 1; 
} 

例子：

foreach($locations as $key => $count) { 
    echo "$count in $key <br />"; 
} 

Answer 2

这可能是因为i在你开始迭代，尝试把$i = 0;的foreach开始后的那一刻不确定。