使用PHP自带的filter函数进行数据校验
<?phpforeach(filter_list() as $id => $filter){ echo $filter.' '.filter_id($filter)."\n";}?><?php /*** an integer to check ***/ $int = 1234; /*** validate the integer ***/ echo filter_var($int, FILTER_VALIDATE_INT); //1234?>
<?php /*** an integer to check ***/ $int = 'abc1234'; /*** validate the integer ***/ echo filter_var($int, FILTER_VALIDATE_INT);?>
<?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 /*** 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("options" => array("min_range" => $min, "max_range" => $max)));?><?php /*** an integer to check ***/ $int = 12; /*** lower limit of the int ***/ $min = 10; /*** validate the integer ***/ echo filter_var($int, FILTER_VALIDATE_INT,array('options' => array('min_range' => $min))); //12?><?php /*** an array of values to filter ***/ $arr = array(10,"109","", "-1234", "some text", "asdf234asdfgs", array()); /*** create an array of filtered values ***/ $filtered_array = filter_var_array($arr, FILTER_VALIDATE_INT); /*** print out the results ***/ foreach($filtered_array as $key => $value) { echo $key.' -- '.$value.'<br />'; }?>0 -- 101 -- 1092 -- 3 -- -12344 -- 5 -- 6 -- Array
<?php /*** a hex value to check ***/ $hex = "0xff"; /*** filter with HEX flag ***/ echo filter_var($hex, FILTER_VALIDATE_INT, array("flags" => FILTER_FLAG_ALLOW_HEX)); //255?><?php /*** test for a boolean value ***/ echo filter_var("true", FILTER_VALIDATE_BOOLEAN); //1?><?php /*** a simple array ***/ $array = array(1,2,3,4,5); /*** test for a boolean value ***/ echo filter_var(in_array(3, $array), FILTER_VALIDATE_BOOLEAN) ? "TRUE" : "FALSE"; //true?>
<?php /*** a multi dimensional array ***/ $array = array(0, 1, 2, 3, 4, array(0, 1, 2, 3, 4)); /*** create the list of values ***/ $values = filter_var($array, FILTER_VALIDATE_BOOLEAN, FILTER_REQUIRE_ARRAY); /*** dump the values ***/ var_dump($values);?>
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 /*** 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 /*** an array of values ***/ $array = array(1.2,"1.7","", "-12345.678", "some text", "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);?>
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 /*** 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, FILTER_VALIDATE_FLOAT, array("options" => array("decimal" => $dec_sep))); /*** dump the results ***/ var_dump($out); }?>float(1.234)Warning: filter_var() [function.filter-var]: decimal separator must be one char in /www/filter.php on line 13bool(false)bool(false)
<?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 /*** 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 $email = "[email protected] mple.com"; if(!filter_var($email, FILTER_VALIDATE_EMAIL)) { echo "E-mail is not valid"; } else { echo "E-mail is valid"; }?><?php function convertSpace($string) { return str_replace(" ", "_", $string); } $string = "Peter is a great guy!"; echo filter_var($string, FILTER_CALLBACK,array("options" => "convertSpace"));?>Peter_is_a_great_guy!
![[Web-Frontend] Node.js-Schnellstart](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
