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@ 2021-10-08T13:26:51Z

<?php

function sql(callable $expr): array
{
    if ($context = (new \ReflectionFunction($expr))->getClosureThis()) {
        $placeholder = new class($context) {
            private object $context;
            private ReflectionObject $reflection;

            public function __construct(object $context) {
                $this->context = $context;
                $this->reflection = new \ReflectionObject($context);
            }

            public function __call($method, $args)
            {
                $method = $this->reflection->getMethod($method);

                return $method->getClosure($this->context)->call($this->context, ...$args);
            }

            public function __get($property)
            {
                $property = $this->reflection->getProperty($property);
                $property->setAccessible(true);

                return $property->getValue($this->context);
            }

            public function __isset($property): bool
            {
                return $this->reflection->hasProperty($property);
            }

            public function __set($property, $value): void
            {
                $property = $this->reflection->getProperty($property);
                $property->setAccessible(true);
                $property->setValue($this->context, $value);
            }

            public function __toString(): string {
                return '?';
            }
        };
    } else {
        $placeholder = new class {
            public function __toString(): string {
                return '?';
            }
        };
    }

    $expr = Closure::fromCallable($expr)
        ->bindTo($placeholder, $placeholder);

    $params = [];
    $generator = $expr();
    while ($generator->valid()) {
        $params[] = $generator->current(); // Get the value from "yield"
        $generator->send('this'); // Insert placeholder
    }

    return [$generator->getReturn(), $params];
}

class Foo {
    private int $id = 42;

    public function bar(): void {
        [$query, $params] = sql(fn() => "SELECT * FROM users WHERE id = ${yield $this->id} OR username = ${yield $this->username()}");
        
        var_dump(
            $query,
            $params,
        );
    }

    private function username(): string {
        return 'azjezz';
    }
}

$f = new Foo();
$f->bar();

Output for 8.2.0 - 8.2.29, 8.3.0 - 8.3.4, 8.3.6 - 8.3.26, 8.4.1 - 8.4.13: Deprecated: Using ${expr} (variable variables) in strings is deprecated, use {${expr}} instead in /in/h00Uq on line 71 Deprecated: Using ${expr} (variable variables) in strings is deprecated, use {${expr}} instead in /in/h00Uq on line 71 string(48) "SELECT * FROM users WHERE id = ? OR username = ?" array(2) { [0]=> int(42) [1]=> string(6) "azjezz" }
Output for 8.3.5: Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 Deprecated: Using ${expr} (variable variables) in strings is deprecated, use {${expr}} instead in /in/h00Uq on line 71 Deprecated: Using ${expr} (variable variables) in strings is deprecated, use {${expr}} instead in /in/h00Uq on line 71 string(48) "SELECT * FROM users WHERE id = ? OR username = ?" array(2) { [0]=> int(42) [1]=> string(6) "azjezz" }
Output for 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33: string(48) "SELECT * FROM users WHERE id = ? OR username = ?" array(2) { [0]=> int(42) [1]=> string(6) "azjezz" }
Output for 7.3.0 - 7.3.33: Parse error: syntax error, unexpected 'object' (T_STRING), expecting function (T_FUNCTION) or const (T_CONST) in /in/h00Uq on line 7
Process exited with code 255.

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