Php parameter data type

Php php parameter data type code example

That all implementing classes will have to be able to use methods with not specified parameter — parameter that was required by method inside interface. calling inside method body is some kind of way out, but it’s realy not a good way. Solution 1: In other DB abstraction frameworks in other languages it can be used for things like making sure you’re doing the proper escaping for in-lining values (for drivers that don’t support proper bound parameters) and improving network efficiency by making sure numbers are binary packed appropriately (given protocol support).

Dynamic methods with parameters typing in PHP

If I understand your question correctly, you want to check what typehint the method wants. I took this code snippet from the docs.

getMethod('FireCannon')->getParameters(); //Loop through each parameter and get the type foreach($parameters as $param) < //Before you call getClass() that class must be defined! echo $param->getClass()->name; > 

To add the code above to your code. This would check if the parameter in the method is an object, if is an object it will check that the class is the same as the value given. If the parameter is not an object, you can either just call the method, or if you typehint your non-object parameters, you can check that they are equal as well. This code should definitely be modified and cleaned up, but I thought it would be enough to get my point across.

class Model < public function find () < $nameClass = get_called_class(); $instance = new $nameClass; $result = $this->conn->select();//the select method returns a SQL SELECT from the database if (!isset($result[0])) < throw new Exception('You have a error in your class'); >foreach ($result[0] as $key => $val) < $methodProp = $this->getMethod($key); $reflector = new ReflectionClass($nameClass); $reflectorMethod = $reflector->getMethod($methodProp); // Make sure method doesn't require more than one param, // and it has defined at least one param. if ($reflectorMethod->getNumberOfRequiredParameters() > 1 || $reflectorMethod->getNumberOfParameters() < 1 ) < // Throw error >//Get the parameters of a method $parameters = $reflectorMethod->getParameters(); if (is_object($parameters[0])) < if (!is_object($val) < // Throw error >//Before you call get_class() that class must be defined! //Use either class_exists($nameClass); or //in_array($nameClass, get_declared_classes()); to check. if ($val->getClass()->name !== get_class($parameters[0])) < // Throw error >> else if (gettype($parameters[0]) !== gettype($val)) < // Throw error >$instance->$methodProp($val); > > > 

public function setClient (Client $cli) < //do stuff >

See how you have a class name next to the argument? That’s called type hinting. It means that argument MUST be an instance of the class you specified or you’ll get the error you posted. Somewhere in your code you’re calling

And $param is not an instance of Client . So that is what you have to fix. Whatever calls setClient has to have an instance of Client .

$param = new Client(); $method($param); 

PHP interface: specify a parameter list, but not the, «But each mapper will specify the parameter type.» — I have to say that can’t be done. Interface must be implemented. What does it mean? That all implementing classes will have to be able to use methods with not specified parameter — parameter that was required by method inside interface.. calling …

PHP PDO::bindParam() data types.. how does it work?

In other DB abstraction frameworks in other languages it can be used for things like making sure you’re doing the proper escaping for in-lining values (for drivers that don’t support proper bound parameters) and improving network efficiency by making sure numbers are binary packed appropriately (given protocol support). It looks like in PDO, it doesn’t do much.

 if (PDO_PARAM_TYPE(param->param_type) == PDO_PARAM_STR && param->max_value_len parameter)) < if (Z_TYPE_P(param->parameter) == IS_DOUBLE) < char *p; int len = spprintf(&p, 0, "%F", Z_DVAL_P(param->parameter)); ZVAL_STRINGL(param->parameter, p, len, 0); > else < convert_to_string(param->parameter); > > else if (PDO_PARAM_TYPE(param->param_type) == PDO_PARAM_INT && Z_TYPE_P(param->parameter) == IS_BOOL) < convert_to_long(param->parameter); > else if (PDO_PARAM_TYPE(param->param_type) == PDO_PARAM_BOOL && Z_TYPE_P(param->parameter) == IS_LONG) < convert_to_boolean(param->parameter); > 

So, if you say it is a STR (or if you say nothing at all as that is the default) and your data’s internal type is a double then it will turn it into a string using one method, if it’s not a double then it will convert it to a string using a different method.

If you say it’s an int but it is really a bool then it will convert it to a long.

If you say it’s a bool but it’s really a number then it will convert it to a true boolean.

This is really all I saw (quickly) looking at the stmt source, I imagine once you pass the parameters into the driver they can do additional magic. So, I’d guess that all you get is a little bit of do the right and a whole lot of behavior ambiguity and variance between drivers.

So I decided to dive into the PHP source code and this is what I found.

static int really_register_bound_param in ext/pdo/pdo_stmt.c on line 329 of version 5.2.9

if (PDO_PARAM_TYPE(param->param_type) == PDO_PARAM_STR && param->max_value_len parameter)) < if (Z_TYPE_P(param->parameter) == IS_DOUBLE) < char *p; int len = spprintf(&p, 0, "%F", Z_DVAL_P(param->parameter)); ZVAL_STRINGL(param->parameter, p, len, 0); > else < convert_to_string(param->parameter); > > else if (PDO_PARAM_TYPE(param->param_type) == PDO_PARAM_INT && Z_TYPE_P(param->parameter) == IS_BOOL) < convert_to_long(param->parameter); > else if (PDO_PARAM_TYPE(param->param_type) == PDO_PARAM_BOOL && Z_TYPE_P(param->parameter) == IS_LONG) < convert_to_boolean(param->parameter); > 

These are the conversions PDO does during binding.

• PDO::PARAM_STR converts whatever you give it to a string except null.
• PDO::PARAM_INT converts bools into longs
• PDO::PARAM_BOOL converts longs into bools

That’s it. Nothing else is converted. PDO uses the PARAM flags to format SQL not to cast data types.

There’s at least one effect PDO::PARAM_INT has on INSERT queries: boolean values are converted to 0 or 1. Like in

$i = true; $stmt->bindParam(':i', $v, PDO::PARAM_INT);

else if (PDO_PARAM_TYPE(param->param_type) == PDO_PARAM_INT && Z_TYPE_P(param->parameter) == IS_BOOL) < convert_to_long(param->parameter); >

Ajax data: formData with parameter Code Example, form data object is in ajax jquery. fetching a form and form data ajax. formdata data get form jquery in ajax. ajax send data using form data in get requst. ajax new formdata (this) ajax load pass form data. get form values ajax. get form input data to pass to ajax request. get data from form on ajax.

PHP interface: specify a parameter list, but not the parameter type

«But each mapper will specify the parameter type.» — I have to say that can’t be done.

Interface must be implemented. What does it mean? That all implementing classes will have to be able to use methods with not specified parameter — parameter that was required by method inside interface.

calling instanceof inside method body is some kind of way out, but it’s realy not a good way.

Read about strategy pattern , I bet it can solve your problem — http://sourcemaking.com/design_patterns/strategy/php

interface iObject <> class Car implements iObject interface iMapper < public function insert(iObject $obj); public function update(iObject $obj); public function delete(iObject $obj); >class CarMapper implements iMapper < public function insert(Car $obj)<>public function update(Car $obj)<> public function delete(Car $obj)<> > 

interface iMapper < public function insert(Car $obj); public function update(Car $obj); public function delete(Car $obj); >class CarMapper implements iMapper < public function insert(Car $obj)<>public function update(Car $obj)<> public function delete(Car $obj)<> > 

interface and class methods must match! Same type hinting must be used.

Php get parameter Code Example, levenshtein (PHP 4 >= 4.0.1, PHP 5, PHP 7, PHP 8) levenshtein — Calculate Levenshtein distance between two strings how to count number of rows in sql using php php numeros enteros

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Php parameter data type

While waiting for native support for typed arrays, here are a couple of alternative ways to ensure strong typing of arrays by abusing variadic functions. The performance of these methods is a mystery to the writer and so the responsibility of benchmarking them falls unto the reader.

PHP 5.6 added the splat operator (. ) which is used to unpack arrays to be used as function arguments. PHP 7.0 added scalar type hints. Latter versions of PHP have further improved the type system. With these additions and improvements, it is possible to have a decent support for typed arrays.

function typeArrayNullInt (? int . $arg ): void >

function doSomething (array $ints ): void (function (? int . $arg ) <>)(. $ints );
// Alternatively,
( fn (? int . $arg ) => $arg )(. $ints );
// Or to avoid cluttering memory with too many closures
typeArrayNullInt (. $ints );

function doSomethingElse (? int . $ints ): void /* . */
>

$ints = [ 1 , 2 , 3 , 4 , null ];
doSomething ( $ints );
doSomethingElse (. $ints );
?>

Both methods work with all type declarations. The key idea here is to have the functions throw a runtime error if they encounter a typing violation. The typing method used in doSomethingElse is cleaner of the two but it disallows having any other parameters after the variadic parameter. It also requires the call site to be aware of this typing implementation and unpack the array. The method used in doSomething is messier but it does not require the call site to be aware of the typing method as the unpacking is performed within the function. It is also less ambiguous as the doSomethingElse would also accept n individual parameters where as doSomething only accepts an array. doSomething’s method is also easier to strip away if native typed array support is ever added to PHP. Both of these methods only work for input parameters. An array return value type check would need to take place at the call site.

If strict_types is not enabled, it may be desirable to return the coerced scalar values from the type check function (e.g. floats and strings become integers) to ensure proper typing.

same data type and same value but first function declare as a argument type declaration and return int(7)
and second fucntion declare as a return type declaration but return int(8).

function argument_type_declaration(int $a, int $b) return $a+$b;
>

function return_type_declaration($a,$b) :int return $a+$b;
>

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Php parameter data type

To experiment on performance of pass-by-reference and pass-by-value, I used this script. Conclusions are below.

#!/usr/bin/php
function sum ( $array , $max ) < //For Reference, use: "&$array"
$sum = 0 ;
for ( $i = 0 ; $i < 2 ; $i ++)#$array[$i]++; //Uncomment this line to modify the array within the function.
$sum += $array [ $i ];
>
return ( $sum );
>

$max = 1E7 //10 M data points.
$data = range ( 0 , $max , 1 );

$start = microtime ( true );
for ( $x = 0 ; $x < 100 ; $x ++)$sum = sum ( $data , $max );
>
$end = microtime ( true );
echo «Time: » .( $end — $start ). » s\n» ;

/* Run times:
# PASS BY MODIFIED? Time
— ——- ——— —-
1 value no 56 us
2 reference no 58 us

3 valuue yes 129 s
4 reference yes 66 us

1. PHP is already smart about zero-copy / copy-on-write. A function call does NOT copy the data unless it needs to; the data is
only copied on write. That’s why #1 and #2 take similar times, whereas #3 takes 2 million times longer than #4.
[You never need to use &$array to ask the compiler to do a zero-copy optimisation; it can work that out for itself.]

2. You do use &$array to tell the compiler «it is OK for the function to over-write my argument in place, I don’t need the original
any more.» This can make a huge difference to performance when we have large amounts of memory to copy.
(This is the only way it is done in C, arrays are always passed as pointers)

3. The other use of & is as a way to specify where data should be *returned*. (e.g. as used by exec() ).
(This is a C-like way of passing pointers for outputs, whereas PHP functions normally return complex types, or multiple answers
in an array)

5. Sometimes, pass by reference could be at the choice of the caller, NOT the function definitition. PHP doesn’t allow it, but it
would be meaningful for the caller to decide to pass data in as a reference. i.e. «I’m done with the variable, it’s OK to stomp
on it in memory».
*/
?>

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