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POC https://wiki.php.net/rfc/function-composition #18800

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POC https://wiki.php.net/rfc/function-composition #18800

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18 changes: 18 additions & 0 deletions Zend/tests/composed_callable_001.phpt
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Original file line number Diff line number Diff line change
@@ -0,0 +1,18 @@
--TEST--
Composed callable using direct object methods.
--FILE--
<?php

$cb = new \ComposedCallable(strtolower(...));
var_dump($cb("Hello"));
$cb->prepend(fn($x) => "$x World");
var_dump($cb("Hello"));
$cb->append('strrev');
var_dump($cb("Hello"));
$cb->insert(ucfirst(...), 2);
var_dump($cb("Hello"));
--EXPECT--
string(5) "hello"
string(11) "hello world"
string(11) "dlrow olleh"
string(11) "dlrow olleH"
12 changes: 12 additions & 0 deletions Zend/tests/composed_callable_002.phpt
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Original file line number Diff line number Diff line change
@@ -0,0 +1,12 @@
--TEST--
Composed callable using composition.
--FILE--
<?php

$cb1 = new \ComposedCallable([strtolower(...)]);
$cb2 = $cb1 + strrev(...);
var_dump($cb1("Hello World"));
var_dump($cb2("Hello World"));
--EXPECT--
string(11) "hello world"
string(11) "dlrow olleh"
9 changes: 9 additions & 0 deletions Zend/tests/composed_callable_003.phpt
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@@ -0,0 +1,9 @@
--TEST--
Composed callable using composition and auto-promotion
--FILE--
<?php

$cb = strtolower(...) + str_rot13(...) + (fn($x) => "<$x>");
var_dump($cb("Hello World"));
--EXPECT--
string(13) "<uryyb jbeyq>"
10 changes: 10 additions & 0 deletions Zend/zend_closures.c
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Original file line number Diff line number Diff line change
Expand Up @@ -21,6 +21,7 @@
#include "zend.h"
#include "zend_API.h"
#include "zend_closures.h"
#include "zend_composed_callable.h"
#include "zend_exceptions.h"
#include "zend_interfaces.h"
#include "zend_objects.h"
Expand Down Expand Up @@ -705,6 +706,14 @@ ZEND_COLD ZEND_METHOD(Closure, __construct)
}
/* }}} */

static zend_result zend_closure_do_operation(uint8_t opcode, zval *result, zval *op1, zval *op2) {
if (opcode != ZEND_ADD) {
return FAILURE;
}

return zend_composed_callable_new_from_pair(result, op1, op2);
}

void zend_register_closure_ce(void) /* {{{ */
{
zend_ce_closure = register_class_Closure();
Expand All @@ -720,6 +729,7 @@ void zend_register_closure_ce(void) /* {{{ */
closure_handlers.get_debug_info = zend_closure_get_debug_info;
closure_handlers.get_closure = zend_closure_get_closure;
closure_handlers.get_gc = zend_closure_get_gc;
closure_handlers.do_operation = zend_closure_do_operation;
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Interesting! That's not at all how I would have thought to do it.

If I follow, this is implemented as an operator override on closures, rather than special casing the operator itself, yes?

}
/* }}} */

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