php in_array function usage (example)

Function introduction:

in_array() function is used to search whether the specified value exists in the array. Returns TRUE if the value is found in the array, FALSE otherwise.

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Function syntax:

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

Parameter introduction:

• needle Required. Specifies the value to search for in the array.​

• haystack Required. Specifies the array to search.

• #strict Optional. If this parameter is set to TRUE, the in_array() function checks whether the data being searched is of the same type as the value of the array.

Code example one:

Search for the value "phpcn" in the array and output some text:

<?php
$sites = array("Google", "phpcn", "Taobao", "Facebook"); 
if (in_array("phpcn", $sites)){
    echo "找到匹配项！";
}else{
    echo "没有找到匹配项！";
}
?>

Output result:

找到匹配项！

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Code example two:

<?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 result:

匹配未找到
匹配已找到
匹配未找到

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