如何使用PHP中的過濾器執行搜索？

Question

我需要指定6個不同的和不同的搜索過濾器以不同的方式來執行使用PHP在mysql數據庫中進行搜索。我很困惑如何去做。

我正在一個網站，我需要進行非常大的搜索與6個不同的搜索過濾器。

這似乎對我來說很複雜，因爲這是我第一次用這個複雜的邏輯編寫這麼多的代碼。

這是HTML代碼：

<input type='text' name='searchterm' /> 

<select name='ind' class='custom-select'> 
    <option value='0'> Select Industry</option> 
    <option value='1'> Real Estate </option> 
    <option value='2'> Hospitality/Hotel/Tourism/Travel & Aviation </option> 
    <option value='3'> Financial Services/Banking </option> 
</select>   

<select name='spec' class='custom-select'> 
    <option value='0'> Select Specialization</option> 
    <option value='1'> Accounting/Banking & Finance/Insurance </option> 
    <option value='2'> Administration/Management/Executive </option> 
    <option value='3'> Architecture/Construction/Civil </option> 
</select>   

<select name='loc' class='custom-select'> 
    <option value='0'> Select Location</option> 
    <option value='1'> Lagos </option> 
</select> 

完整的HTML代碼是在這裏：http://jsbin.com/otibel/1/

有6個不同的選擇框，並各自爲搜索過濾器。

用戶只能選擇一個選擇框，一次搜索或選擇兩個，或一次選擇兩個搜索過濾器，依此類推。

我設法做搜索過濾器只要6，這個代碼是當用戶只選擇一個搜索過濾器。

function performSearchWithFilter(){ 
    if (($_GET['ind'] > 0) && (isset($_GET['ind'])) && ($_GET['spec'] <= 0) && ($_GET['loc'] <= 0) && ($_GET['workexp'] <= 0) && ($_GET['type'] <= 0) && ($_GET['qualfctn'] <= 0)){ 
     //it will carry out the search, when just the ind select box has been selected 
    } else if (($_GET['ind'] <= 0) && ($_GET['spec'] > 0) && isset($_GET['spec']) && ($_GET['loc'] <= 0) && ($_GET['workexp'] <= 0) && ($_GET['type'] <= 0) && ($_GET['qualfctn'] <= 0)) { 
     //it will carry out the search, when just the spec select box has been selected 
    } else if (($_GET['ind'] <= 0) && ($_GET['spec'] <= 0) && ($_GET['loc'] > 0) && (isset($_GET['loc'])) && ($_GET['workexp'] <= 0) && ($_GET['type'] <= 0) && ($_GET['qualfctn'] <= 0)) { 
     //it will carry out the search, when just the loc select box has been selected 
    } else if (($_GET['ind'] <= 0) && ($_GET['spec'] <= 0) && ($_GET['loc'] <= 0) && ($_GET['workexp'] > 0) && isset($_GET['workexp']) && ($_GET['type'] <= 0) && ($_GET['qualfctn'] <= 0)) { 
     //it will carry out the search, when just the workexp select box has been selected 
    } else if (($_GET['ind'] <= 0) && ($_GET['spec'] <= 0) && ($_GET['loc'] <= 0) && ($_GET['workexp'] <= 0) && ($_GET['type'] > 0) && isset($_GET['type']) && ($_GET['qualfctn'] <= 0)) { 
     //it will carry out the search, when just the type select box has been selected 
    } else if (($_GET['ind'] <= 0) && ($_GET['spec'] <= 0) && ($_GET['loc'] <= 0) && ($_GET['workexp'] <= 0) && ($_GET['type'] <= 0) && ($_GET['qualfctn'] > 0) && isset($_GET['qualfctn'])) { 
     //it will carry out the search, when just the qualfctn select box has been selected 
    } 
} 

我知道我可以這樣編寫搜索代碼，但它必須是25個不同的else語句，而且看起來很複雜。

我使用的排列與組合數學式爲具有佈置在算法這樣的6個搜尋參數：

ind, spec, loc, workexp, type, qualfctn, ind & spec, ind & loc, ind & workexp, ind & type, ind & qualfctn, spec & loc, spec & workexp, spec & type, spec & qualfctn, loc & workexp, loc & type, loc & qualfctn, workexp & type, workexp & qualfctn, type & qualfctn, ind & spec & loc & workexp & type & qualfctn, ind & spec & loc & workexp & type, ind & spec & loc & workexp, ind & spec & loc. 

這是我提出的搜索過濾器算法，即，如果用戶選擇的搜索過濾器 以不同的方式。

PHP中的哪些搜索插件，框架或Librbary可以爲我執行此操作，使用多個篩選器進行搜索並最大限度地減少我編寫的代碼量，因此我不必開始編寫大塊代碼或重新創建輪子再一次，我真的很困惑該怎麼做，以及如何做到這一點。

Answer 1

一個有點冗長的代碼來讀取所有的變量，但一旦他們被讀取，一個簡單的查詢語句來運行您的搜索。我已經根據註釋中的解釋對數據庫表的結構做了一些假設，並且自然需要初始化數據庫連接。

// this code assumes that $link has been initialized as a mysqli object 
// with database connection open. 
// assuming database table name is "people" 
// assuming database table column names match the names of GET variables 
// if any of these assumptions are incorrect, you'll need to modify the 
// code to match the DB 

// initialize WHERE conditions 
$conditions = "1=1"; 

// test for ind 
if(isset($_GET['ind']) && ($_GET['ind'] > 0)) { 
    $conditions .= " AND ind='".$link->real_escape_string($_GET['ind'])."'"; 
} 

// test for spec 
if(isset($_GET['spec']) && ($_GET['spec'] > 0)) { 
    $conditions .= " AND spec='".$link->real_escape_string($_GET['spec'])."'"; 
} 

// test for loc 
if(isset($_GET['loc']) && ($_GET['loc'] > 0)) { 
    $conditions .= " AND loc='".$link->real_escape_string($_GET['loc'])."'"; 
} 

// test for workexp 
if(isset($_GET['workexp']) && ($_GET['workexp'] > 0)) { 
    $conditions .= " AND workexp='".$link->real_escape_string($_GET['workexp'])."'"; 
} 

// test for type 
if(isset($_GET['type']) && ($_GET['type'] > 0)) { 
    $conditions .= " AND type='".$link->real_escape_string($_GET['type'])."'"; 
} 

// test for qualfctn 
if(isset($_GET['qualfctn']) && ($_GET['qualfctn'] > 0)) { 
    $conditions .= " AND qualfctn='".$link->real_escape_string($_GET['qualfctn'])."'"; 
} 

// make sure we have at least one condition 
if(!$first) { 
    if(!$result = $link->query(" 
     SELECT * 
     FROM people 
     WHERE ".$conditions 
    )) { 
     // your error handling here 
    } 

    // read the results here 

    $result->free(); 
}