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The main content of this article is to explain "what are the elements and key names in the matching search array in the PHP array operation". Interested friends may wish to have a look. The method introduced in this paper is simple, fast and practical. Now let the editor take you to learn "what are the elements and key names in the matching search array in the PHP array operation?"

In_array () function-matches array elements to return Boolean

In PHP, we can search the elements in the array through the in_array () function. The basic syntax format of the in_array () function is as follows:

In_array (search,array,type)

It should be noted that the parameter search represents the value we need to search in the array, the parameter array represents the array we need to search, and the parameter type is an optional parameter. If the value of the parameter is true, it will check whether the searched data is the same as the searched array data type.

If we find the value we need to search in the array, the result returned by the function is true;. If we don't find the value we need to search in the array, the result is false.

Next, let's take a look at the application of the in_array () function in PHP through a simple example, as follows:

Output result:

In the above example, when we match the search for the third time, we use lowercase and do not match successfully. It is important to note that if the content we need to search is a string and the parameter type is set to true, then the search will be case-sensitive.

Array_search () function-matches the array element to return the key name

The knowledge of the in_array function above simply searches to determine whether there are any elements we need to find in the array, and there is no way to locate them. If we want to find them accurately, we can use the array_search () function in PHP to search for elements, and the result is the key name of our search elements.

The basic syntax format of the array_search () function is as follows:

Array_search (value,array,strict)

It should be noted that the parameter value is the key we need to search, the parameter array is the array we need to search, and the parameter strict is an optional parameter. By default, this parameter is flase. If the parameter is set to true, it will check whether the searched data is the same as the searched array data type.

If the corresponding key value is searched in the array, the result returned is the key name corresponding to the key value; if it does not match, the result returned is flase;. Note that if there is more than one key value matched, the returned result is the key name that matches the key value for the first time.

Let's take a look at the use of the array_search function through an example, as follows:

Output result:

It should be noted that when the parameter is set to true, the search results are different for different data forms when searching and matching in the array.

Array_key_exists () function-matches the array key name to return Boolean

In the above, we can output the key name of the search element by searching the key value through the array_search function, and we can also search the key name directly in PHP. That is through the array_key_exists function in PHP.

The basic syntax format of the array_key_exists function is as follows:

Array_key_exists (key,array)

It should be noted that the parameter key represents the key name we need to search, and the parameter array identifies the array we need to search.

The array_key_exists function can only judge the key name in the one-dimensional array, but not the key name in the array in the multi-dimensional array. If the specified key name is matched in the array, the result returned by this function is true, if there is no match in the array. The result returned is flase.

Let's take a look at the use of the array_key_exists function through an example, as follows:

Output result:

So we use array_key_exists to find a specified key in an array.

At this point, I believe you have a deeper understanding of what the elements and key names of the matching search array in the PHP array operation are, so you might as well do it in practice. Here is the website, more related content can enter the relevant channels to inquire, follow us, continue to learn!

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