PHP uses the In_array function to check if a value exists in the array _php tutorial

PHP uses the In_array function to check if a value exists in the array

This article mainly introduces PHP using the In_array function to check if there is a value in the array, a more detailed analysis of the function of the In_array function, definition and related use of skills and considerations, with a certain reference value, the need for friends can refer to the next

This example describes how PHP uses the In_array function to check if a value exists in an array. Share to everyone for your reference. The specific analysis is as follows:

PHP uses the In_array () function to check if a value exists in the array, return TRUE if it exists, or return false, which is very useful, and I'll dive into the In_array () function for you.

When writing a piece of code in PHP recently, it is used to determine whether a value is in another set of values. The In_array function is used to check if a value exists in the array. Directly through the conceptual understanding of the fuzzy, you can use specific examples to understand its role.

The syntax is as follows:

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1	BOOL In_array (mixed needle, array array [, BOOL strict])

Parameter description:

Parameters	Description
Needle	The value that needs to be searched in the array, if it is a string, is case-sensitive
Array	The array to retrieve
Strict	Optional, if set to TRUE, the value types in the needle and array are also checked

Example 1:

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$os = Array ("Mac", "NT", "Irix", "Linux"); if (In_array ("Irix", $os)) { echo "Got Irix"; } if (In_array ("Mac", $os)) { echo "Got mac"; } ?>

The result of the above code execution is:

Got Irix

The second condition fails because In_array () is case-sensitive.

Example 2:

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$europe = Array ("United States", "United Kingdom", "France", "Germany", "Italy", "Spain", "Denmark"); if (In_array ("Us", $europe)) { echo "True"; } ?>

As with the above, the execution result is true.

Example 3: Strict type checking examples

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$a = Array (' 1.10 ', 12.4, 1.13); if (In_array (' 12.4 ', $a, true)) { echo "' 12.4 ' found with strict check"; } if (In_array (1.13, $a, true)) { echo "1.13 found with strict check"; } ?>

The output is:

1.13 Found with strict check

Example 4: Applying an array in an array

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$a = array (' P ', ' h '), Array (' P ', ' r '), ' o '); if (In_array (' P ', ' h '), $a)) { echo "' ph ' was found"; } if (In_array (Array (' f ', ' I '), $a)) { echo "' fi ' was found"; } if (In_array (' o ', $a)) { echo "' O ' was found"; } ?>

The output is:

' ph ' was found
' O ' was found

Its specific usage is as follows:

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1	BOOL In_array (mixed $needle, array $haystack [, bool $strict = FALSE])

Search for needle in haystack, if not set strict then use a loose comparison.

Note: Since php5.4. The array definition is replaced by array () array[].

I hope this article is helpful to everyone's PHP programming.

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