PHP Multidimensional mixed arrays - php

Question

How Do I access the innermost array? the grade is giving me a Notice: Array to string conversion in /scripts/array.php on line 34
grade: Array
$data = array();
$data[0] = 78;
$data[1] = 34;
$data[2] = 87;
$student = array(0 => array(
"Stdno" => "212",
"name" => "Lorem Ipsum",
"subject" => "Networking",
"grade" => $data
),
1 => array(
"Stdno" => "212",
"name" => "Jimmy Shu",
"subject" => "Informatics",
"grade" => $data
),
2 => array(
"Stdno" => "212",
"name" => "Amet Dolor",
"subject" => "Discrete Combinatorics",
"grade" => $data
)
);
foreach ($student as $key => $value) {
foreach ($value as $key => $value) {
echo "<b>{$key}</b>: {$value}";
echo "<br />";
}
echo "<br />";
}

Answer 1

First of all, you should really not use $key and $value again (in fact, I thought foreach ($value as $key=>$value) didn't work).
Assuming you want to echo the $data element at the same position than in your $student array (i.e. echo $data[0] for $student[0]), you should use the first key :
foreach ($student as $key => $value) {
foreach ($value as $key2 => $value2) {
echo "<b>{$key2}</b>: ";
if ($key2 == 'grade')
echo $value2[$key];
else
echo $value2;
echo "<br />";
}
echo "<br />";
}

Answer 2

First, just a comment please avoid using same keys on foreach. like in your $value.
To fix your issue, it clearly says, it's an array but you try to echo it, you could try to use this instead.
echo "<b>{$key}</b>: " . json_encode($value);

Answer 3

As stated by #roberto06 you should avoid using same variables for cycles that are nested. Those variables will be overwriten by new values.
To the question:
You could check wether $value is string or array
is_array($val) || is_string($val)
based on result you could write another foreach cycle or print string.
in your second foreach you are foreaching this array:
array(
"Stdno" => "212",
"name" => "Lorem Ipsum",
"subject" => "Networking",
"grade" => $data
)
so the (second) $key will be "Stdno", "name", "subject", "grade"
and values will be "212", "Lorem Ipsum", "Networking" (those are strings) and $data (this is array)
to print this array, you need to create new foreach and use it only when $key == "grade" or use implode on it:
if($key == "grade"){
$i = implode(', ', $value);
//print or something
}