lambda-style function in php

Question

See the code below.

 $newfunc = create_function('$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

Can any one tell how come it output lambda_1 when print $newfunc? and different output on second time.

DEMO

Nothing wrong...just could not understood how it worked. Hope you can help me. — Poonam Bhatt
– Poonam Bhatt, Commented Dec 29, 2010 at 11:24
what exactly do you mean? What aspect of the function is your question about? — Pekka
– Pekka, Commented Dec 29, 2010 at 11:27
@Pekka: My question is, why it returned lambda_1 for echo "New anonymous function: $newfunc\n"; And adding more to it, when i refresh that page it increment that number by one. — Poonam Bhatt
– Poonam Bhatt, Commented Dec 29, 2010 at 11:30

JP19 · Accepted Answer · 2010-12-29 11:30:00Z

3

Its just that anonymous functions are internally named lambda_1, lambda_2, etc. So you the first echo statement gives "New anonymous function: lambda_1"

The function itself is returning a string, hence the second echo statement (echo $newfunc(2, M_E) . "\n";) gives ln(2) + ln(2.718281828459) = 1.6931471805599

answered Dec 29, 2010 at 11:30

JP19

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