How to determine if a value is in an array in php

There are three methods:

1. Use the in_array() function

in_array($value,$array)
注意：in_array('','',true)还有第三个参数，为true时还会判断数据类型

2. First use the array_flip() function to key the array Invert the value, and then make a judgment

if(isset($array[$value])){
}

3. First convert the array into a string, and then use the strpos function for further processing

public static function inArray($item, $array) {
    $str = implode(',', $array);
    $str = ',' . $str . ',';
    $item = ',' . $item . ',';
    return false !== strpos($item, $str) ? true : false;
}

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