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

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

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Release： 2016-07-13 10:00:32

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

The example in this article describes how PHP uses the in_array function to check whether a certain value exists in the 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.

syntax is as follows:

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

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Parameter description:


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

例1：

<&#63;php
$os = array("Mac", "NT", "Irix", "Linux");
if (in_array("Irix", $os)) {
 echo "Got Irix";
}
if (in_array("mac", $os)) {
 echo "Got mac";
}
&#63;>

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以上代码的执行结果是：

Got Irix

第二个条件失败，因为 in_array() 是区分大小写的。

例2：

<&#63;php
$europe = array("美国","英国","法国","德国","意大利","西班牙","丹麦");
if (in_array("美国",$europe)) {
echo "True";
}
&#63;>

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同上面一样，执行结果为True 。

例3：严格类型检查例子

<&#63;php
$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 ";
}
&#63;>

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其输出结果是：

1.13 found with strict check

例4：数组中套用数组

<&#63;php
$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 ";
}
&#63;>

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其输出结果为：

'ph' was found
'o' was found

其具体用法如下：

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

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在 haystack 中搜索 needle，如果没有设置 strict 则使用宽松的比较。

注：自php5.4以后。数组定义由array()换成了array[] 。

希望本文所述对大家的php程序设计有所帮助。