How to remove empty strings from php array

In PHP development, arrays are a commonly used data structure, and arrays often need to be operated on. However, in actual development, there may be some empty strings in the array, and these empty strings may cause unnecessary trouble in our data processing, so we need to remove them from the array. This article will introduce how to remove empty strings from arrays in PHP.

1. What is a PHP array?

The PHP array is a data structure used to store multiple values. It is easy to use and flexible. In PHP, arrays can store different types of data, such as numeric types, strings, objects, etc. At the same time, a PHP array is an associative array, that is to say, we can access the elements in the array through a key-value pair. This The key in a key-value pair is usually a string.

In PHP, we can use the following two ways to define an array:

1. Use the array() function:

$array = array ('key1' => 'value1', 'key2' => 'value2', 'key3' => 'value3');

2. Use square brackets directly:

$array = ['key1' => 'value1', 'key2' => 'value2', 'key3' => 'value3'];

2. PHP array Methods to remove empty strings

In actual development, there may be some empty strings in the array, and these empty strings may affect our data processing. Therefore, we need to remove them from the array. Here are several PHP methods to remove empty strings from arrays:

1. Use foreach loop to remove empty strings

$array = array('value1', '', 'value2', '', 'value3');
foreach($array as $key => $value){

if($value == ''){
    unset($array[$key]);
}

}

In the above code, we use foreach The loop iterates through the elements in the array in sequence. If the element is an empty string, use the unset() function to remove it from the array. This method is one of the most common ways to remove empty strings from an array.

2. Use the array_filter function to remove empty strings

$array = array('value1', '', 'value2', '', 'value3');
$array = array_filter($array, 'strlen');
print_r($array);

In the above code, we use the array_filter() function, which can filter out the array Some elements that do not meet the criteria are removed from the array. The second parameter 'strlen' specifies the filter condition, that is, we will use the strlen function to detect whether the array element is an empty string.

3. Use the array_diff function to remove empty strings

$array = array('value1', '', 'value2', '', 'value3');
$array = array_diff($array, array(''));
print_r($array);

In the above code, we use the array_diff() function to compare the difference between two arrays Set, that is, we compare all the elements in one array with the elements in the second array, find the parts where they differ and return them. In this case, the second array contains only empty strings, so this function will remove all empty strings from the original array.

3. Summary

Arrays are commonly used data structures in PHP. We need to frequently operate on them, including removing empty strings, etc. This article introduces three methods to remove empty strings from PHP arrays, using foreach loop, array_filter and array_diff respectively. Of course, for different scenarios, we need to choose the most suitable method to operate to improve the performance and efficiency of the program.

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