PHP Multidimensional Array Length

Question

This is a multidimensional PHP array.

$stdnt = array(
    array("Arafat", 12210261, 2.91),
    array("Rafat", 12210262, 2.92),
    array("Marlin", 12210263, 2.93),
    array("Aziz", 12210264, 2.94),
);

I can find out the length of the array. That means

count($stdnt); // output is 4

[
    array("Arafat", 12210261, 2.91),
    array("Rafat", 12210262, 2.92),
    array("Marlin", 12210263, 2.93),
    array("Aziz", 12210264, 2.94)
] ` 

But can't get the internal array length.

How can I ?

Answer 1

If you are assuming the subarrays are all the same length then:

$count = count($stdnt[0]);

If you don't know the keys:

$count = count(reset($stdnt));

To get an array with a separate count of each of the subarrays:

$counts = array_map('count', $stdnt);

Answer 2

The other way to count internal array lengths is to iterate through the array using foreach loop.

<?php 
$stdnt = array(
    array("Arafat", 12210261, 2.91),
    array("Rafat", 12210262, 2.92),
    array("Marlin", 12210263, 2.93),
    array("Aziz", 12210264, 2.94),
);

foreach($stdnt as $s)
{
    echo "<br>".count($s);
}
?>  

Answer 3

please use sizeof function or count function with recursive

 e.g echo (sizeof($stdnt,1) - sizeof($stdnt)) ; // this will output you 9 as you want .

first sizeof($stdntt,1) ; // will output you 13 . count of entire array and 1 mean recursive .

Answer 4

According to the hint from Meaning of Three dot (…) in PHP, the following code is what I usually use for this case:

$stdnt = array(
    array("Arafat", 12210261, 2.91),
    array("Rafat", 12210262, 2.92),
    array("Marlin", 12210263, 2.93),
    array("Aziz", 12210264, 2.94),
);
echo count(array_merge(...$stdnt));

The Splat operator "..." will only work,

• Only if the first level keys are in integer, ie, not "strings"
• PHP > 5.6

Answer 5

  // You may try as per this sample  

  $cars=array(
    array("volvo",43,56),
    array("bmw",54,678)
  );
  $mySubSize=sizeof($cars);
  for ($i=0;$i<$mySubSize;$i++) {
    foreach ($cars[$i] as $value) {
      echo "$value <br>";
    }
  }