Function handling Funkcje
PHP Manual

create_function

(PHP 4 >= 4.0.1, PHP 5)

create_functionCreate an anonymous (lambda-style) function

Opis

string create_function ( string $args , string $code )

Creates an anonymous function from the parameters passed, and returns a unique name for it.

Parametry

Usually these parameters will be passed as single quote delimited strings. The reason for using single quoted strings, is to protect the variable names from parsing, otherwise, if you use double quotes there will be a need to escape the variable names, e.g. \$avar.

args

The function arguments.

code

The function code.

Zwracane wartości

Returns a unique function name as a string, or FALSE on error.

Przykłady

Przykład #1 Creating an anonymous function with create_function()

You can use this function, to (for example) create a function from information gathered at run time:

<?php
$newfunc 
create_function('$a,$b''return "ln($a) + ln($b) = " . log($a * $b);');
echo 
"New anonymous function: $newfunc\n";
echo 
$newfunc(2M_E) . "\n";
// outputs
// New anonymous function: lambda_1
// ln(2) + ln(2.718281828459) = 1.6931471805599
?>

Or, perhaps to have general handler function that can apply a set of operations to a list of parameters:

Przykład #2 Making a general processing function with create_function()

<?php
function process($var1$var2$farr)
{
    foreach (
$farr as $f) {
        echo 
$f($var1$var2) . "\n";
    }
}

// create a bunch of math functions
$f1 'if ($a >=0) {return "b*a^2 = ".$b*sqrt($a);} else {return false;}';
$f2 "return \"min(b^2+a, a^2,b) = \".min(\$a*\$a+\$b,\$b*\$b+\$a);";
$f3 'if ($a > 0 && $b != 0) {return "ln(a)/b = ".log($a)/$b; } else { return false; }';
$farr = array(
    
create_function('$x,$y''return "some trig: ".(sin($x) + $x*cos($y));'),
    
create_function('$x,$y''return "a hypotenuse: ".sqrt($x*$x + $y*$y);'),
    
create_function('$a,$b'$f1),
    
create_function('$a,$b'$f2),
    
create_function('$a,$b'$f3)
    );

echo 
"\nUsing the first array of anonymous functions\n";
echo 
"parameters: 2.3445, M_PI\n";
process(2.3445M_PI$farr);

// now make a bunch of string processing functions
$garr = array(
    
create_function('$b,$a''if (strncmp($a, $b, 3) == 0) return "** \"$a\" '.
    
'and \"$b\"\n** Look the same to me! (looking at the first 3 chars)";'),
    
create_function('$a,$b''; return "CRCs: " . crc32($a) . ", ".crc32($b);'),
    
create_function('$a,$b''; return "similar(a,b) = " . similar_text($a, $b, &$p) . "($p%)";')
    );
echo 
"\nUsing the second array of anonymous functions\n";
process("Twas brilling and the slithy toves""Twas the night"$garr);
?>

Powyższy przykład wyświetli:

Using the first array of anonymous functions
parameters: 2.3445, M_PI
some trig: -1.6291725057799
a hypotenuse: 3.9199852871011
b*a^2 = 4.8103313314525
min(b^2+a, a^2,b) = 8.6382729035898
ln(a)/b = 0.27122299212594

Using the second array of anonymous functions
** "Twas the night" and "Twas brilling and the slithy toves"
** Look the same to me! (looking at the first 3 chars)
CRCs: -725381282, 342550513
similar(a,b) = 11(45.833333333333%)

But perhaps the most common use for of lambda-style (anonymous) functions is to create callback functions, for example when using array_walk() or usort()

Przykład #3 Using anonymous functions as callback functions

<?php
$av 
= array("the ""a ""that ""this ");
array_walk($avcreate_function('&$v,$k''$v = $v . "mango";'));
print_r($av);
?>

Powyższy przykład wyświetli:

Array
(
  [0] => the mango
  [1] => a mango
  [2] => that mango
  [3] => this mango
)

an array of strings ordered from shorter to longer

<?php

$sv 
= array("small""larger""a big string""it is a string thing");
print_r($sv);

?>

Powyższy przykład wyświetli:

Array
(
  [0] => small
  [1] => larger
  [2] => a big string
  [3] => it is a string thing
)

sort it from longer to shorter

<?php

usort
($svcreate_function('$a,$b','return strlen($b) - strlen($a);'));
print_r($sv);

?>

Powyższy przykład wyświetli:

Array
(
  [0] => it is a string thing
  [1] => a big string
  [2] => larger
  [3] => small
)

Zobacz też:


Function handling Funkcje
PHP Manual