How to output multiple arrays in php

As a scripting language, PHP often needs to use data structures such as arrays when processing data. When using multiple arrays for related operations, the output results will also be different. This article mainly discusses how to output multiple arrays.

Methods to create arrays in PHP:

There are two main ways to create arrays in PHP: direct creation and creation using the Array() function. To create an array directly, you can add [] after the variable name, or you can use the array() function.

Create an array directly:

$arr1 = ['apple', 'banana', 'orange'];

Create using the Array() function:

$arr2 = array('apple', 'banana', 'orange');

The arrays created by the above two methods are the same, but using the Array() function can It is convenient to add array items without adding extra symbols.

Output of multiple arrays:

In PHP, the output of multiple arrays can be operated in the following ways:

1. Use the for loop structure to output multiple arrays Arrays

When using multiple arrays, you can use the for loop structure for output. The specific steps are as follows:

$arr1 = array('apple', 'banana', 'orange');
$arr2 = array('red', 'yellow', 'orange');

for($i=0; $i<count($arr1); $i++)
{
    echo $arr1[$i] . ' is ' . $arr2[$i] . '<br/>';
}

In this code, use the for loop structure to traverse the array and obtain the elements of each array through counter $i. Concatenate the elements of the two arrays and print the output.

2. Use the foreach statement to output multiple arrays

In addition to using a for loop, you can also use foreach traversal to output multiple arrays. The specific steps are as follows:

$arr1 = array('apple', 'banana', 'orange');
$arr2 = array('red', 'yellow', 'orange');

foreach($arr1 as $key=>$value)
{
    echo $value . ' is ' . $arr2[$key] . '<br/>';
}

In this code, use the foreach statement to obtain the key-value pairs of the array, and output the elements of the two arrays through the key-value pairs.

3. Use multi-dimensional array output

In PHP, arrays can also be multi-dimensional, and output by using multi-dimensional arrays is also a common method. The specific steps are as follows:

$arr = array(
            array('apple', 'banana', 'orange'),
            array('red', 'yellow', 'orange')
       );

for($i=0; $i<count($arr[0]); $i++)
{
    echo $arr[0][$i] . ' is ' . $arr[1][$i] . '<br/>';
}

In this code, use multi-dimensional arrays to store the elements of the two arrays, then use the for loop structure to obtain the elements of each array, and concatenate the elements of the two arrays and print them out. .

4. Use the implode function to output multiple arrays

In addition to using loop structures and multi-dimensional arrays, you can also use the implode function to combine multiple arrays into one string for output. The specific steps are as follows:

$arr1 = array('apple', 'banana', 'orange');
$arr2 = array('red', 'yellow', 'orange');

echo implode(' is ', $arr1) . '<br/>';
echo implode(' is ', $arr2) . '<br/>';

In this code, use the implode function to splice the original array into a string, use 'is' as the connection symbol, and print the string.

Summary:

In PHP, the output of multiple arrays can be operated using a variety of methods such as for loops, foreach statements, multi-dimensional arrays and implode functions. Through flexible selection, the output results can be made more beautiful, clear and clear.

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