How to use in_array in php? (Usage introduction)

In php, the in_array() function is used to search whether a specified value exists in the array, the syntax is "in_array(search,array,type)"; if the search parameter is a string, and the type parameter is set to TRUE, the search is case-sensitive.

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in_array() function searches whether the specified value exists in the array.

Syntax

in_array(search,array,type)

Parameters:

• ##search Required. Specifies the value to search for in the array.

• array Required. Specifies the array to search.

• #type Optional. If this parameter is set to true, it is checked whether the type of the searched data and the value of the array are the same.​

Description

• Returns true if the given value search exists in the array array. If the third parameter is set to true, the function returns true only if the element exists in the array and has the same data type as the given value.

• If the parameter is not found in the array, the function returns false.

• If the search parameter is a string and the type parameter is set to true, the search is case-sensitive.

Return value: Returns TRUE if the value is found in the array, otherwise returns FALSE.

Example:

<?php
$people = array("Bill", "Steve", "Mark", "David");

if (in_array("23", $people, TRUE))
  {
  echo "匹配已找到<br>";
  }
else
  {
  echo "匹配未找到<br>";
  }
if (in_array("Mark",$people, TRUE))
  {
  echo "匹配已找到<br>";
  }
else
  {
  echo "匹配未找到<br>";
  }

if (in_array(23,$people, TRUE))
  {
  echo "匹配已找到<br>";
  }
else
  {
  echo "匹配未找到<br>";
  }
?>

Output:

匹配未找到
匹配已找到
匹配未找到

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