PHP Implode Associative Array

问题

So I'm trying to create a function that generates a SQL query string based on a multi dimensional array.

Example:

function createQueryString($arrayToSelect, $table, $conditionalArray) {
$queryStr = "SELECT ".implode(", ", $arrayToSelect)." FROM ".$table." WHERE ";
$queryStr = $queryStr.implode(" AND ",$conditionalArray); /*NEED HELP HERE*/
return $queryStr;
}

$columnsToSelect = array('ID','username');
$table = 'table';
$conditions = array('lastname'=>'doe','zipcode'=>'12345');
echo createQueryString($columnsToSelect, $table, $conditions); /*will result in incorrect SQL syntax*/

as you can see I need help with the 3rd line as it's currently printing

SELECT ID, username FROM table WHERE lastname AND zipcode

but it should be printing

SELECT ID, username FROM table WHERE lastname = 'doe' AND zipcode = '12345'

回答1:

You're not actually imploding a multidimensional array. $conditions is an associative array.

Just use a foreach loop inside your function createQueryString(). Something like this should work, note it's untested.:

$terms = count($conditionalArray);
foreach ($conditionalArray as $field => $value)
{
    $terms--;
    $queryStr .= $field . ' = ' . $value;
    if ($terms)
    {
        $queryStr .= ' AND ';
    }
}

Note: To prevent SQL injection, the values should be escaped and/or quoted as appropriate/necessary for the DB employed. Don't just copy and paste; think!

回答2:

function implodeItem(&$item, $key) // Note the &$item
{
  $item = $key . "=" . $item;
}

[...]

$conditionals = array(
  "foo" => "bar"
);

array_walk($conditionals, "implodeItem");
implode(' AND ', $conditionals);

Untested, but something like this should work. This way you can also check if $item is an array and use IN for those cases.

回答3:

You will have to write another function to process the $conditionalArray, i.e. processing the $key => $value and handling the types, e.g. applying quotes if they're string.

Are you just dealing with = condition? What about LIKE, <, >?

回答4:

Forgive me if its not too sexy !

 $data = array('name'=>'xzy',
              'zip'=>'3432',
              'city'=>'NYK',
              'state'=>'Alaska');


$x=preg_replace('/^(.*)$/e', ' "$1=\'". $data["$1"]."\'" ',array_flip($data));

$x=implode(' AND ' , $x);

So the output will be sth like :

 name='xzy' AND zip='3432' AND city='NYK' AND state='Alaska'

回答5:

I'd advise against automated conditionals creation.
Your case is too local, while there can be many other operators - LIKE, IN, BETWEEN, <, > etc.
Some logic including several ANDs and ORs.

The best way is manual way.
I am always doing such things this way

if (!empty($_GET['rooms']))     $w[]="rooms='".mesc($_GET['rooms'])."'";
if (!empty($_GET['space']))     $w[]="space='".mesc($_GET['space'])."'";
if (!empty($_GET['max_price'])) $w[]="price < '".mesc($_GET['max_price'])."'";

Though if you still want it with this simple array, just iterate it using

foreach ($conditions as $fieldname => $value)...

and then combine these variables in the way you need. you have 2 options: make another array of this with field='value' pairs and then implode it, or just concatenate, and substr trailing AND at the end.

回答6:

I use a variation of this:

function implode_assoc($glue,$sep,$arr)
{
    if (empty($glue)) {$glue='; ';}
    if (empty($sep)) {$sep=' = ';}
    if (is_array($arr))
    {
        foreach ($arr as $k=>$v)
        {
            $str .= $k.$sep.$v.$glue;
        }
        return $str;
    } else {
        return false;
    }
};

It's rough but works.

回答7:

Here is a working version:

//use: implode_assoc($v,"="," / ")
//changed: argument order, when passing to function, and in function
//output: $_FILES array ... name=order_btn.jpg / type=image/jpeg / tmp_name=G:\wamp\tmp\phpBDC9.tmp / error=0 / size=0 / 

function implode_assoc($arr,$glue,$sep){
    $str = '';
    if (empty($glue)) {$glue='; ';}
    if (empty($sep)) {$sep=' = ';}
    if (is_array($arr))
    {
        foreach ($arr as $key=>$value)
        {
            $str .= $key.$glue.$value.$sep;
        }
        return $str;
    } else {
        return false;
    }
}

回答8:

I know this is for the case of a pdo mysql type.. but what i do is build pdo wrapper methods, and in this case i do this function that helps to build the string, since we work with keys, there is no possible way to mysql inject, since i know the keys i define / accept manually.

imagine this data:

           $data=array(
            "name"=>$_GET["name"],
            "email"=>$_GET["email"]
);

you defined utils methods...

public static function serialize_type($obj,$mode){
$d2="";
if($mode=="insert"){
    $d2.=" (".implode(",",array_keys($obj)).") ";
    $d2.=" VALUES(";
foreach ($obj as $key=>$item){$d2.=":".$key.",";}
$d2=rtrim($d2,",").")";}

if($mode=="update"){
    foreach ($obj as $key=>$item){$d2.=$key."=:".$key.",";}    
}
return rtrim($d2,",");
}

then the query bind array builder ( i could use direct array reference but lets simplify):

  public static function bind_build($array){
     $query_array=$array;
     foreach ($query_array as $key => $value) { $query_array[":".$key] =   $query_array[$key]; unset($query_array[$key]); } //auto prepair array for PDO
return $query_array;    }

then you execute...

$query ="insert into table_x ".self::serialize_type( $data, "insert" );
$me->statement = @$me->dbh->prepare( $query ); 
$me->result=$me->statement->execute( self::bind_build($data) );

You could also go for an update easy with...

  $query ="update table_x set ".self::serialize_type( $data, "update" )." where id=:id";
    $me->statement = @$me->dbh->prepare( $query ); 

    $data["id"]="123"; //add the id 
    $me->result=$me->statement->execute( self::bind_build($data) );

But the most important part here is the serialize_type function

回答9:

Try this

function GeraSQL($funcao, $tabela, $chave, $valor, $campos) {
    $SQL = '';

    if ($funcao == 'UPDATE') :
        //Formata SQL UPDATE

        $SQL  = "UPDATE $tabela SET ";
        foreach ($campos as $campo => $valor) :
            $SQL .= "$campo = '$valor', ";
        endforeach;
        $SQL  = substr($SQL, 0, -2);
        $SQL .= " WHERE $chave = '$valor' ";

    elseif ($funcao == 'INSERT') :
        //Formata SQL INSERT

        $SQL  = "INSERT INTO $tabela ";

        $SQL .= "(" . implode(", ", array_keys($campos) ) . ")";

        $SQL .= " VALUES ('" . implode("', '", $campos) . "')";         

    endif;

    return $SQL;
}

//Use
$data = array('NAME' => 'JOHN', 'EMAIL' => 'J@GMAIL.COM');
GeraSQL('INSERT', 'Customers', 'CustID', 1000, $data);

来源：https://stackoverflow.com/questions/3276639/php-implode-associative-array

标签

php

arrays

associative-array

implode