代码之家 › 专栏 › 技术社区 › Dogbert

在PHP中作为数组键的数字字符串

php

Dogbert · 技术社区 · 15 年前

是否可以使用类似 "123" 作为PHP数组中的键,而不转换为整数?

$blah = array('123' => 1);
var_dump($blah);

印刷品

array(1) {
  [123]=>
  int(1)
}

我想要

array(1) {
  ["123"]=>
  int(1)
}

11 回复 | 直到 8 年前

Hamish 12 年前

the manual

foo = { '10' : 'bar' };

foo['10']; // "bar"
foo[10]; // "bar"
foo[012]; // "bar"
foo['012']; // undefined!

David 9 年前

stdClass

$data =  new stdClass;
$data->{"12"} = 37;
$data = (array) $data;
var_dump( $data );

array(1) {
  ["12"]=>
  int(37)
}

json_decode() json_encode()

$data['12']

var_dump( $data['12'] ); // int 32

steampowered Brijesh Verma 14 年前

$obj = new stdClass();
$key = '3';
$obj->$key = 'abc';

Undolog 13 年前

$id = 55;
$array = array(
  " $id" => $value
);

foreach( $array as $key => $value ) {
  echo $key;
}

bcosca 15 年前

$x=array((string)123=>'abc');
var_dump($x);
$x[123]='def';
var_dump($x);

Brainfeeder 11 年前

$data = array_merge($data, $extra); 6 '6' "6" (string)"6" n

$data = $data + $extra;

TarranJones 10 年前

$array_assoc = cast($arr,'array_assoc');

$array_sequential = cast($arr,'array_sequential');

$obj = cast($arr,'object');

$json = cast($arr,'json');



function cast($var, $type){

    $orig_type = gettype($var);

    if($orig_type == 'string'){

        if($type == 'object'){
            $temp = json_decode($var);
        } else if($type == 'array'){
            $temp = json_decode($var, true);
        }
        if(isset($temp) && json_last_error() == JSON_ERROR_NONE){
            return $temp;
        }
    }
    if(@settype($var, $type)){
        return $var;
    }
    switch( $orig_type ) {

        case 'array' :

            if($type == 'array_assoc'){

                $obj = new stdClass;
                foreach($var as $key => $value){
                    $obj->{$key} = $value;
                }
                return (array) $obj;

            } else if($type == 'array_sequential'){

                return array_values($var);

            } else if($type == 'json'){

                return json_encode($var);
            }
        break;
    }
    return null; // or trigger_error
}

GigiManco 8 年前

     $a = array('foo','bar','baz');
     echo "RESULT: ", json_encode($a, JSON_FORCE_OBJECT);

     RESULT: {"0" : "foo", "1": "bar", "2" : "baz"}

fisharebest 13 年前

$array=array(''=>'empty', '0'=>'zero', '1'=>'one');
echo "Test 1\n";
foreach ($array as $key=>$value) {
    if ($key == '') { // Error - wrongly finds '0' as well
        echo "$value\n";
    }
}
echo "Test 2\n";
foreach ($array as $key=>$value) {
    if ($key === '0') { // Error - doesn't find '0'
        echo "$value\n";
    }
}

echo "Test 3\n";
foreach ($array as $key=>$value) {
    if ((string)$key == '') { // Cast back to string - fixes problem
        echo "$value\n";
    }
}
echo "Test 4\n";
foreach ($array as $key=>$value) {
    if ((string)$key === '0') { // Cast back to string - fixes problem
        echo "$value\n";
    }
}

Nico Schefer 9 年前

$data = new stdClass;
$data->{"0"} = "Zero";
$data->{"1"} = "One";
$data->{"A"} = "A";
$data->{"B"} = "B";

$data = (array)$data;

var_dump($data);
/*
Note the key "0" is correctly saved as a string:
array(3) {
  ["0"]=>
  string(4) "Zero"
  ["A"]=>
  string(1) "A"
  ["B"]=>
  string(1) "B"
}
*/

//Now let's access the associative array via the values 
//given from var_dump() above:
var_dump($data["0"]); // NULL -> Expected string(1) "0"
var_dump($data[0]); // NULL (as expected)
var_dump($data["1"]); // NULL -> Expected string(1) "1"
var_dump($data[1]); // NULL (as expected)
var_dump($data["A"]); // string(1) "A" (as expected)
var_dump($data["B"]); // string(1) "B" (as expected)

-1

drchuck 10 年前

https://en.wikipedia.org/wiki/ASCII

for(...) {

    $database[$sha.'!'] = array($sha,$name,$age);
}

ksort($database);
$row = reset($database);
$topsha = $row[0];