PHP uses in_array function to check whether a value exists in an array

PHP uses the in_array function to check whether a certain value exists in the array

This article mainly introduces PHP using the in_array function to check whether a certain value exists in the array, with a more detailed analysis The function, definition and related usage skills and precautions of the in_array function are explained. It has certain reference value. Friends in need can refer to it

The example in this article describes how PHP uses the in_array function to check whether a certain value exists in an array. Share it with everyone for your reference. The specific analysis is as follows:

PHP uses the in_array() function to check whether a certain value exists in the array. If it exists, it returns TRUE, otherwise it returns FALSE. It is very easy to use. Let me introduce the in_array() function to you in depth.

When I was writing a piece of code in PHP recently, I needed to determine whether a certain value was in another set of values. The in_array function is used to check whether a certain value exists in the array. It is relatively vague to understand directly through concepts, and its function can be understood through specific examples.

The syntax is as follows:

1	bool in_array( mixed needle, array array [, bool strict] )

bool in_array( mixed needle, array array [, bool strict] )


参数	说明
needle	需要在数组中搜索的值，如果是字符串，则区分大小写
array	需要检索的数组
strict	可选，如果设置为 TRUE ，则还会对 needle 与 array 中的值类型进行检查

Parameter description:

Example 1:

$os = array("Mac", "NT", "Irix", "Linux");

if (in_array("Irix", $os)) {

echo "Got Irix";

}

if (in_array("mac", $os)) {

echo "Got mac";

}

$europe = array("美国","英国","法国","德国","意大利","西班牙","丹麦");

if (in_array("美国",$europe)) {

echo "True";

}

7 8

$os = array("Mac", "NT", "Irix", "Linux");

if (in_array("Irix", $os)) {

$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 ";

}

echo "Got Irix"; } if (in_array("mac", $os)) { echo "Got mac"; } ?> The execution result of the above code is: Got Irix The second condition fails because in_array() is case sensitive. Example 2: ?

1 2 3 4 5 6

<🎜>$europe = array("United States", "UK", "France", "Germany", "Italy", "Spain", "Denmark"); <🎜> <🎜>if (in_array("United States",$europe)) {<🎜> <🎜>echo "True";<🎜> <🎜>}<🎜> <🎜>?>

Same as above, the execution result is True. Example 3: Strict type checking example ?

1 2 3 4 5 6 7 8 9

<🎜>$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 result is:

1.13 found with strict check

Example 4: Applying arrays within arrays

$a = array(array('p', 'h'), array('p', 'r'), 'o');

if (in_array(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 ";

}

1 2

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

9 10

$a = array(array('p', 'h'), array('p', 'r'), 'o');

if (in_array(array('p', 'h'), $a)) {

echo "'o' was found ";

}

The output result is: 'ph' was found 'o' was found The specific usage is as follows: ?

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

Search for needle in haystack, using relaxed comparison if strict is not set. Note: since php5.4. The array definition is changed from array() to array[]. I hope this article will be helpful to everyone’s PHP programming design. http://www.bkjia.com/PHPjc/973922.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/973922.htmlTechArticlePHP uses the in_array function to check whether a certain value exists in the array. This article mainly introduces PHP's use of the in_array function to check the array. Whether there is a certain value in, a more detailed analysis of the in_array function...

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PHP uses in_array function to check whether a value exists in an array_PHP tutorial

PHP uses the in_array function to check whether a certain value exists in the array