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 ?
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);
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);
}
?>
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 .
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,
// 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>";
}
}
Since there is no function in PHP to yield the "Dimension" and "Length Of Each Dimension" of a multidimensional array (Matrix), we can write a recursive function to obtain all lengths of each dimension:
// Get The Dimension Of An Array
function countdim($array){
if (is_array($array)){
return countdim(reset($array)) + 1;
}else{
return 0;
}
}
// Get The Length Of Array
function len($array){
$dim = countdim($array);
if ($dim == 0){
return 0;
}elseif ($dim == 1) {
return array(count($array));
}else{
$len = array(count($array));
return array_merge($len, len($array[0]));
}
}
And Then Call "len($stdnt);" And It Will Give You "array(4, 3)"
