Bagaimana cara mengambil data dari database tanpa loop di php?

I was having trouble with returning PDO query results in arrays, due to the structure of the results of those queries (query array with arrays for results inside). Now when executing a fetchAll() on a query you get the following:

Array ( [0] = Array ( [key1] => "value1", [key2] => "value2") [1] = Array( [key1] => "value1", [key2] => "value2") )

This is a smaller array, but return results in a HUGE database this way and it quickly becomes IMPPOSIBRU to read out the array given._

This is where the glorious foreach comes in! We all know the basic writing of a foreach (foreach ($array as $key => $value) {...}), but with query results there's a twist, as both the $key AND $value variables are arrays, where $key is the array of the query containing the result arrays and $value is/are the result array(s) themselves.

So in this foreach we have to talk directly to $value to get our results! This would look something like this:_

  foreach ($query as $key => $value) {
      return $value["key2"];
  }

?>_

This already does the job, but to return them in arrays we have to change our return code a little bit, like so:_

   foreach ($query as $key => $value) {
      return array (
             "key1" => $value["key1"],
             "key2" => $value["key2"]
      );
   }

?>_

Array ( [0] = Array ( [key1] => "value1", [key2] => "value2") [1] = Array( [key1] => "value1", [key2] => "value2") )0

Array ( [0] = Array ( [key1] => "value1", [key2] => "value2") [1] = Array( [key1] => "value1", [key2] => "value2") )1

Array ( [0] = Array ( [key1] => "value1", [key2] => "value2") [1] = Array( [key1] => "value1", [key2] => "value2") )2

to print an array, simply use print_r(array name)

like this:
    $myrow = mysql_fetch_row($result);
echo "

";
print_r($myrow);
echo "

this will output the array in a readable form, with the index, too. Don't forget the 'pre' tags or the output will be on a single line.

One of the most common mistakes that people make with this function, when using it multiple times in one script, is that they forget to use the mysql_data_seek() function to reset the internal data pointer.

When iterating through an array of MySQL results, e.g.

while ($line = mysql_fetch_array($result, MYSQL_ASSOC)) {
    foreach ($line as $col_value) {
        echo $col_value . '
';
    }
}
?>

the internal data pointer for the array is advanced, incrementally, until there are no more elements left in the array. So, basically, if you copy/pasted the above code into a script TWICE, the second copy would not create any output. The reason is because the data pointer has been advanced to the end of the $line array and returned FALSE upon doing so.

If, for some reason, you wanted to interate through the array a second time, perhaps grabbing a different piece of data from the same result set, you would have to make sure you call

mysql_data_seek($result, 0);
?>

This function resets the pointer and you can re-iterate through the $line array, again!

Loop foreach hanya berfungsi pada array, dan digunakan untuk mengulang setiap pasangan kunci/nilai dalam array

Sintaksis

foreach ($array sebagai $nilai) {
kode yang akan dieksekusi;
}

Untuk setiap iterasi loop, nilai elemen array saat ini ditetapkan ke $value dan penunjuk array dipindahkan satu per satu, hingga mencapai elemen array terakhir

The for_ loop - Loops melalui blok kode beberapa kali tertentu

PHP untuk Loop

Loop for digunakan saat Anda mengetahui sebelumnya berapa kali skrip harus dijalankan

Sintaksis

for (penghitung init; penghitung tes; penghitung kenaikan) {
kode yang akan dieksekusi untuk setiap iterasi;
}

Parameter

• penghitung init. Inisialisasi nilai penghitung loop
• penghitung tes. Dievaluasi untuk setiap iterasi loop. Jika hasilnya BENAR, pengulangan berlanjut. Jika bernilai FALSE, loop berakhir
• penghitung kenaikan. Meningkatkan nilai penghitung loop

Contoh

Contoh di bawah menampilkan angka dari 0 sampai 10

Contoh

untuk ($x = 0; $x <= 10; $x++) {
gema "Nomornya adalah. $x
";
}
?>

Contoh Dijelaskan

• $x = 0;
• $x <= 10;
• $x++ - Tingkatkan nilai penghitung loop sebesar 1 untuk setiap iterasi

Contoh ini menghitung sampai 100 kali puluhan

Contoh

untuk ($x = 0; $x <= 100; $x+=10) {
gema "Nomornya adalah. $x
";
}
?>

Contoh Dijelaskan

• $x = 0;
• $x <= 100;
• $x+=10 - Tingkatkan nilai penghitung loop sebesar 10 untuk setiap iterasi

Latihan PHP

Uji Diri Anda Dengan Latihan

Latihan

Buat lingkaran yang berjalan dari 0 hingga 9

 ($i = 0; $i < 10; ) {
  echo $i;
}

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