How to output multidimensional array in php

PHP is an object-oriented scripting language that is widely used in server-side script programming. PHP variable types include strings, integers, floating point numbers, Boolean values, NULL, arrays, etc. Among them, array is one of the most commonly used data types in PHP, which can be used to store multiple data items and supports multi-dimensional arrays.

Multidimensional array refers to an array containing another array, that is, each element in an array is also an array. In PHP, to output a multi-dimensional array, it needs to be achieved through loops and conditional statements. This article will introduce how to output multi-dimensional arrays in PHP.

1. Create a multidimensional array

In PHP, you can use the array() function to create an array, and you can create a multidimensional array through the following syntax:

$array_name = array(
    array(value1, value2, ...),
    array(value1, value2, ...),
    ...
);

Among them, $array_name is the variable name of the array, and each array() function represents an array element. The sample code is as follows:

$multi_array = array(
    array('apple', 'red', 'sweet'),
    array('orange', 'orange', 'sour'),
    array('banana', 'yellow', 'sweet')
);

The above code creates a multi-dimensional array $multi_array containing three arrays. Each array contains three elements, representing the name, color and taste of the fruit respectively.

2. Output a multi-dimensional array

1. Use a for loop to output a multi-dimensional array

In PHP, you can use a for loop to traverse the array, and use the echo statement to print it out. For multi-dimensional arrays, you need to use nested for loops to iterate through each sub-array. The sample code is as follows:

for ($i = 0; $i < count($multi_array); $i++) {
    for ($j = 0; $j < count($multi_array[$i]); $j++) {
        echo $multi_array[$i][$j] . " ";
    }
    echo "<br>";
}

The above code first uses the outer for loop to traverse each sub-array in the $multi_array array, the inner for loop traverses the elements in each sub-array, and uses the echo statement to print it out. Whenever the inner loop ends, use the echo "
" statement to print a blank line to make the output more readable.

After the above code is executed, the output result is as follows:

apple red sweet 
orange orange sour 
banana yellow sweet 

2. Use foreach loop to output multi-dimensional array

In addition to using for loop to traverse multi-dimensional array, you can also use foreach loop to output array elements. When the foreach loop traverses the array, it assigns each element of the array to a variable, making the code easier to understand and maintain. For multi-dimensional arrays, nested foreach loops need to be used. The sample code is as follows:

foreach ($multi_array as $sub_array) {
    foreach ($sub_array as $key => $value) {
        echo $key . ": " . $value . " ";
    }
    echo "<br>";
}

The above code uses the outer foreach loop to traverse each sub-array in the $multi_array array, the inner foreach loop to traverse the elements in each sub-array, and uses the echo statement to print the elements come out. Whenever the inner loop ends, use the echo "
" statement to print a blank line to make the output more readable.

After the above code is executed, the output result is as follows:

0: apple 1: red 2: sweet 
0: orange 1: orange 2: sour 
0: banana 1: yellow 2: sweet 

3. Summary

In PHP, outputting multi-dimensional arrays requires the use of loops and conditional statements. You can use a for loop or foreach loop to traverse the array, and use the echo statement to print out the array elements. If you need to change the output format, you can use conditional statements to modify the output content. By learning to output multi-dimensional arrays, you can better understand array operations in PHP and thus better develop PHP applications.

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