PHP create_function function

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create_function

(PHP 4 >= 4.0.1, PHP 5)

create_function — Create an anonymous (lambda-style) functionDescriptionstring create_function ( string args, string code )

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

Parameters

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.


Return Values

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

Examples

Example 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:

$newfunc = create_function('$a,$b', 'return "ln($a) + ln($b) = " . log($a * $b);');
echo "New anonymous function: $newfunc\n";
echo $newfunc(2, M_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:

Example 2.
Making a general processing function with
create_function()

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(2.3445, M_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);

The above example will output:

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 , 1908338681
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()

Example 3. Using anonymous functions as callback functions

$av = array("the ", "a ", "that ", "this ");
array_walk($av, create_function('&$v,$k', '$v = $v . "mango";'));
print_r($av);

The above example will output:

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

an array of strings ordered from shorter to longer

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

The above example will output:

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

sort it from longer to shorter

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

The above example will output:

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

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Published:
2.26.07 / 1am
Category:
PHP Functions
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