tipos - php length array

Contar las apariciones de un valor en una columna de una matriz de matrices de objetos

Question

Alguien sabe cómo contar las apariciones de "foto" en esta matriz:

 Array (
[0] => stdClass Object ( [type] => photo [id] => 1404781893036 [created_time] => 2012-03-02T07:58:23+0000 )
[1] => stdClass Object ( [type] => photo [id] => 14047818930362 [created_time] => 2012-03-01T14:58:53+0000 )
[2] => stdClass Object ( [type] => status [id] => 1404781893036 [created_time] => 2012-03-01T09:49:40+0000 )
[3] => stdClass Object ( [type] => status [id] => 14047818930362 [created_time] => 2012-03-01T09:36:04+0000 )
[4] => stdClass Object ( [type] => photo [id] => 14047818930362 [created_time] => 2012-02-28T07:03:25+0000 )
[5] => stdClass Object ( [type] => photo [id] => 1404781893036 [created_time] => 2012-02-27T09:15:34+0000 )
[6] => stdClass Object ( [type] => photo [id] => 14047818930362 [created_time] => 2012-02-27T07:32:13+0000 )
[7] => stdClass Object ( [type] => status [id] => 1404781893036 [created_time] => 2012-02-25T09:36:57+0000 )
[8] => stdClass Object ( [type] => photo [id] => 1404781893036 [created_time] => 2012-02-23T08:46:43+0000 )
[9] => stdClass Object ( [type] => status [id] => 1404781893036 [created_time] => 2012-02-22T21:04:30+0000 )
[10] => stdClass Object ( [type] => status [id] => 1404781893036 [created_time] => 2012-02-21T20:38:27+0000 )
[11] => stdClass Object ( [type] => photo [id] => 1404781893036 [created_time] => 2012-02-21T07:22:44+0000 )
[12] => stdClass Object ( [type] => status [id] => 14047818930362 [created_time] => 2012-02-20T08:32:46+0000 )
[13] => stdClass Object ( [type] => status [id] => 1404781893036 [created_time] => 2012-02-17T15:00:11+0000 ) )

Answer 1

Intenta con:

$input = array( /* your data */ );
$count = 0;
foreach ( $input as $value ) {
if ( $value->type == ''photo'' ) {
$count++;
}
}

Answer 2

Me gustaría reconocer que el método de Dor Shemer es (IMO) el método más directo, limpio, legible y confiable. Solo quiero ofrecer algunas alternativas para aquellos que prefieren usar la programación funcional ... array_reduce() es un segundo para mí. Finalmente, quiero identificar un pequeño Gotcha para los métodos que usan array_count_values() - por favor lea en ...

Batería de Métodos: ( Demo )

$photo_count=0; // establish default value
foreach($array as $objects){
if($objects->type===''photo'') ++$photo_count; // pre-increment
}
echo "foreach result = $photo_count";
echo "array_reduce = ",array_reduce($array,function($carry,$objects){return $carry+($objects->type===''photo''?1:0);},0);
echo "array_filter & count = ",sizeof(array_filter($array,function($objects){return $objects->type===''photo'';}));
echo "array_column & array_filter & count = ",sizeof(array_filter(array_column($array,''type''),function($v){return $v===''photo'';}));
echo "array_map & array_count_values & array_replace = ",array_replace([''photo''=>0],array_count_values(array_map(function($o) {return $o->type;}, $array)))[''photo''];
echo "array_map & array_count_values (gives Notice) = ",array_count_values(array_map(function($o) {return $o->type;}, $array))[''photo''];

Entrada / Salida usando datos de muestra de OP (sin problemas):

$array=[
(object)[''type''=>''photo'',''id''=>1404781893036,''created_time''=>''2012-03-02T07:58:23+0000''],
(object)[''type''=>''photo'',''id''=>14047818930362,''created_time''=>''2012-03-01T14:58:53+0000''],
(object)[''type''=>''status'',''id''=>1404781893036,''created_time''=>''2012-03-01T09:49:40+0000''],
(object)[''type''=>''status'',''id''=>14047818930362,''created_time''=>''2012-03-01T09:36:04+0000''],
(object)[''type''=>''photo'',''id''=>14047818930362,''created_time''=>''2012-02-28T07:03:25+0000''],
(object)[''type''=>''photo'',''id''=>1404781893036,''created_time''=>''2012-02-27T09:15:34+0000''],
(object)[''type''=>''photo'',''id''=>14047818930362,''created_time''=>''2012-02-27T07:32:13+0000''],
(object)[''type''=>''status'',''id''=>1404781893036,''created_time''=>''2012-02-25T09:36:57+0000''],
(object)[''type''=>''photo'',''id''=>1404781893036,''created_time''=>''2012-02-23T08:46:43+0000''],
(object)[''type''=>''status'',''id''=>1404781893036,''created_time''=>''2012-02-22T21:04:30+0000''],
(object)[''type''=>''status'',''id''=>1404781893036,''created_time''=>''2012-02-21T20:38:27+0000''],
(object)[''type''=>''photo'',''id''=>1404781893036,''created_time''=>''2012-02-21T07:22:44+0000''],
(object)[''type''=>''status'',''id''=>14047818930362,''created_time''=>''2012-02-20T08:32:46+0000''],
(object)[''type''=>''status'',''id''=>1404781893036,''created_time''=>''2012-02-17T15:00:11+0000'']
];
// output:
foreach result = 7
array_reduce = 7
array_filter & count = 7
array_column & array_filter & count = 7
array_map & array_count_values & array_replace = 7
array_map & array_count_values = 7

Entrada / Salida usando datos sin valores de photo (problema con el array_count_values() 2nd array_count_values() ):

$array=[
(object)[''type''=>''status'',''id''=>1404781893036,''created_time''=>''2012-03-01T09:49:40+0000''],
(object)[''type''=>''status'',''id''=>14047818930362,''created_time''=>''2012-03-01T09:36:04+0000''],
(object)[''type''=>''status'',''id''=>1404781893036,''created_time''=>''2012-02-25T09:36:57+0000''],
(object)[''type''=>''status'',''id''=>1404781893036,''created_time''=>''2012-02-22T21:04:30+0000''],
(object)[''type''=>''status'',''id''=>1404781893036,''created_time''=>''2012-02-21T20:38:27+0000''],
(object)[''type''=>''status'',''id''=>14047818930362,''created_time''=>''2012-02-20T08:32:46+0000''],
(object)[''type''=>''status'',''id''=>1404781893036,''created_time''=>''2012-02-17T15:00:11+0000'']
];
// or if there are no object rows like: $array=[];
// output:
foreach result = 0
array_reduce = 0
array_filter & count = 0
array_column & array_filter & count = 0
array_map & array_count_values & array_replace = 0
array_map & array_count_values (gives Notice) = <br />
<b>Notice</b>: Undefined index: photo in <b>[...][...]</b> on line <b>43</b><br />

array_count_values() no se molesta en generar elementos con un recuento de 0 .

Answer 3

Para contar la ocurrencia coincidente de una cadena en una matriz multidimensional, deberá iterar sobre cada elemento de la matriz y coincidir con la cadena e incrementar el conteo. Al igual que @Dor ha sugerido.

$count = 0;
foreach ($array as $item) {
if ($item->type === ''photo'') {
$count++;
}
}

Si quieres lograr lo mismo en una matriz unidimensional, entonces es bastante sencillo. Puede usar la función de matriz PHP array_count_values como se explica a continuación.

<?php
$array = array(1, "test", 1, "php", "test");
print_r(array_count_values($array));
?>

El ejemplo anterior dará como resultado:

Array
(
[1] => 2
[test] => 2
[php] => 1
)

Answer 4

$count = 0;
foreach ($array as $item) {
if ($item->type === ''photo'') {
$count++;
}
}