Laravel从集合中获取价值

Question

If collection is created from an array:

$collection = collect();
$collection->push([
        'var1'=>'value1',
        'var2'=>'value2'
       ]);

is there possibility to get value for specific key similar way to eloquent collection attributes?

$collection->var1

Answer 1

My variant:

$collection = collect();
$collection->push([
    'var1'=>'value1',
    'var2'=>'value2'
]);
$value = $collection->get('var1'); // value1

https://laravel.com/docs/5.6/collections#method-get

Answer 2

No, but you can definitely do something like

$collection->first(function($value, $key) {
  return $key == 'var1';
});

or simply what @AlexeyMezenin suggested.

$collection[0]['var1'];

Answer 3

My personal touch though I am still learning the basics myself so don't shoot me down for trying! I know its a little extra code but from experience you can get caught out with offset exception errors when calling $collection[0] explicitly (Hope I am making sense as this has been a personal gotcha experience)

My approach would be the following

$collection = collect();
$collection->push([
    'var1'=>'value1',
    'var2'=>'value2'
]);

for ($x = 0; $x < count($collection); $x++) {
    if (isset($collection[$x])) {
        $var = $collection[$x];
    }
}

// Now call what ever variable from the collection you wish:

echo $var['var1'];
echo $var['var2'];

Hope that helps, Like I said though I am far from experienced with php/laravel and I am still learning from research myself :)

Answer 4

To set a key'd value in a collection you can use the put() method.

$collection = collect();

$collection->put("var1", "value1");
$collection->put("var2", "value2");
$collection->put("var3", "value3");

To push just a value without a key to the collection, use the push() method, like you did in the OP.

$collection->push("value4");

To retrieve those value, use get() method;

$collection->get("var2");

Want to see the contents of the collection? Use the dd() method on the collections instances. Both of the following work.

dd($collection)

or

$collection->dd()