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<?php namespace YOOtheme\Http; use Psr\Http\Message\StreamInterface; class CallbackStream implements StreamInterface { /** * @var bool */ protected $called = false; /** * @var callable */ protected $callback; public function __construct(callable $callback) { $this->callback = $callback; } /** * @inheritdoc */ public function __toString() { return $this->getContents(); } /** * @inheritdoc */ public function getContents(): string { if ($this->called) { return ''; } $this->called = true; return ($this->callback)(); } /** * @inheritdoc */ public function close(): void {} /** * @inheritdoc */ public function detach() { return null; } /** * @inheritdoc */ public function getSize(): ?int { return null; } /** * @inheritdoc */ public function tell(): int { return 0; } /** * @inheritdoc */ public function eof(): bool { return $this->called; } /** * @inheritdoc */ public function isSeekable(): bool { return false; } /** * @inheritdoc */ public function seek($offset, $whence = SEEK_SET): void {} /** * @inheritdoc */ public function rewind(): void {} /** * @inheritdoc */ public function isWritable(): bool { return false; } /** * @inheritdoc */ public function write($string): int { return 0; } /** * @inheritdoc */ public function isReadable(): bool { return true; } /** * @inheritdoc */ public function read($length): string { return ''; } /** * @inheritdoc */ public function getMetadata($key = null) { return $key === null ? [] : null; } }
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