How to wrap multidimensional array in php

In PHP, we often use multi-dimensional arrays to store and process data. However, when we output multi-dimensional arrays, we sometimes encounter line wrapping problems. This article will introduce how to implement line wrapping of multi-dimensional arrays in PHP.

1. What is a multidimensional array
In PHP, a multidimensional array refers to an array that contains other arrays. In other words, each element of a multidimensional array is an array. For example, the following is an example of a two-dimensional array:

$array = array(
    array("apple","banana"),
    array("orange","pear","peach"),
    array("grape")
);

2. How to wrap lines in a multidimensional array
When we want to output a multidimensional array to a browser or console, sometimes we will find that each The array elements are all crowded together and difficult to observe. At this point, we need to wrap lines in some places to see the data more clearly. The following is a method to implement multi-dimensional array line wrapping:

1. Use a foreach loop and the HTML

 tag<p>Use a foreach loop to output the multi-dimensional array one by one, and wrap it in the outermost layer HTML's </p><pre class="brush:php;toolbar:false"> tag can realize formatted output and line breaks of arrays. The sample code is as follows: <pre class='brush:php;toolbar:false;'>$data = array(
   array("apple","banana"),
   array("orange","pear","peach"),
   array("grape")
);
echo "<pre class="brush:php;toolbar:false">";
foreach ($data as $value) {
    foreach ($value as $val) {
        echo $val . " ";
    }
    echo "
";
}
echo "

";

In the above code, two foreach loops are used to traverse the first and second level elements of the multi-dimensional array respectively. When traversing the second layer of elements, the echo "
" statement is used to implement line breaks, and the outer layer is wrapped with the HTML

 tag. When output in the browser, you can see the formatted array. <p>2. Use for loop and PHP_EOL constant </p><p>In the above method, HTML tags are used to format the output of the array, but this method is not suitable for outputting the array in the console. . At this time, we can use the PHP_EOL constant to implement line breaks. The sample code is as follows: </p><pre class='brush:php;toolbar:false;'>$data = array(
   array("apple","banana"),
   array("orange","pear","peach"),
   array("grape")
);
for ($i=0; $i<count($data); $i++) {
    for ($j=0; $j<count($data[$i]); $j++) {
        echo $data[$i][$j] . " ";
    }
    echo PHP_EOL;
}

In the above code, two for loops are used. The loop variables $i and $j represent the first layer and the first layer of the multi-dimensional array respectively. The subscript of the second level element. When outputting each element, an echo statement is used, and the PHP_EOL constant is added at the end to implement line breaks.

3. Summary
Multidimensional array is a very common data type in PHP, and there are many ways to process its formatted output and line breaks. This article introduces two commonly used methods, namely using the

 tag in HTML and using the PHP_EOL constant in PHP. Readers can choose a method that suits them according to the actual situation to achieve multi-dimensional array line wrapping. 

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