PHP中filter函数校验数据的方法详解

PHP教程
Filter Name Filter ID
int 257
boolean 258
float 259
validate_regexp 272
validate_url 273
validate_email 274
validate_ip 275
string 513
stripped 513
encoded 514
special_chars 515
full_special_chars 522
unsafe_raw 516
email 517
url 518
number_int 519
number_float 520
magic_quotes 521
callback 1024

PHP教程
<?php
  /*** an integer to check ***/
  $int = 42;
  /*** lower limit of the int ***/
  $min = 50;
  /*** upper limit of the int ***/
  $max = 100;
  /*** validate the integer ***/
  echo filter_var($int,FILTER_VALIDATE_INT,array("min_range" => $min,"max_range" => $max));
  //42
?>

PHP教程
array(6) {
  [0] => bool(false)
  [1] => bool(true)
  [2] => bool(false)
  [3] => bool(false)
  [4] => bool(false)
  [5] => array(5) {
    [0] => bool(false)
    [1] => bool(true)
    [2] => bool(false)
    [3] => bool(false)
    [4] => bool(false)
  }
}

PHP教程
<?php
  /*** an FLOAT value to check ***/
  $float = 22.42;
  /*** validate with the FLOAT flag ***/
  if(filter_var($float,FILTER_VALIDATE_FLOAT) === false)
  {
    echo "$float is not valid!";
  }
  else
  {
    echo "$float is a valid floating point number";
  }
?>

PHP教程
<?php
  /*** an array of values ***/
  $array = array(1.2,"1.7","-12345.678","abcd4.2efgh",array());
  /*** validate the array ***/
  $validation_array = filter_var($array,FILTER_VALIDATE_FLOAT,FILTER_REQUIRE_ARRAY);
  /*** dump the array of validated data ***/
  var_dump($validation_array);
?>

PHP教程
array(7) {
  [0] => float(1.2)
  [1] => float(1.7)
  [2] => bool(false)
  [3] => float(-23234.123)
  [4] => bool(false)
  [5] => bool(false)
  [6] => array(0) { }
}

PHP教程
<?php
  /*** an array of floats with seperators ***/
  $floats = array(
    "1,234" => ",","1.234" => "..","1.2e3" => ","
  );
  /*** validate the floats against the user defined decimal seperators ***/
  foreach ($floats as $float => $dec_sep)
  {
    $out = filter_var($float,array("options" => array("decimal" => $dec_sep)));
    /*** dump the results ***/
    var_dump($out);
  }
?>

PHP教程
<?php
   /*** a rfc compliant web address ***/
  $url = "http://www.phpro.org";
  /*** try to validate the URL ***/
  if(filter_var($url,FILTER_VALIDATE_URL) === FALSE)
  {
    /*** if there is no match ***/
    echo "Sorry,$url is not valid!";
  }
  else
  {
    /*** if we match the pattern ***/
    echo "The URL,$url is valid!<br />";
  }
?>

PHP教程
<?php
  /*** a non rfc compliant URL ***/
  $url = "index.php";
  /*** try to validate the URL ***/
  if(filter_var($url,FILTER_VALIDATE_URL,FILTER_FLAG_SCHEME_REQUIRED) === FALSE)
  {
    /*** if there is no match ***/
    echo "Sorry,$url is not valid!";
  }
  else
  {
    /*** if the URL is valid ***/
    echo "The URL,$url is valid!";
  }
?>

PHP教程
<?php
  $email = "someone@exa mple.com";
  if(!filter_var($email,FILTER_VALIDATE_EMAIL))
  {
    echo "E-mail is not valid";
  }
  else
  {
    echo "E-mail is valid";
  }
?>

PHP教程
<?php
  $email = "someone@exa mple.com";
  if(!filter_var($email,FILTER_VALIDATE_EMAIL))
  {
    echo "E-mail is not valid";
  }
  else
  {
    echo "E-mail is valid";
  }
?>