Online PHP editor | output for Wmqru

@ 2019-10-04T21:14:54Z

<?php

trait StringFunctionMapper
{
	public Closure $substr;
    protected ?string $encoding = null;

	public function setSingleByte(): void
	{
		$this->encoding = null;
		$this->substr = fn (string $string, int $start, int $length = null) => \func_num_args() === 3
		    ? substr($string, $start, $length)
		    : substr($string, $start);
	}

	public function setMultiByte(string $encoding = 'UTF-8'): void
	{
		$this->encoding = $encoding;
		$this->substr = fn (string $string, int $start, int $length = null) => mb_substr($string, $start, $length, $this->encoding);
	}
}
		
$temp = new class () {
	use StringFunctionMapper;
};
		
$temp->setSingleByte();
var_dump(substr("search phrase", 6), ($temp->substr)("search phrase", 6), ($temp->substr)("search phrase", 6, 2));

$temp->setMultiByte();
var_dump(mb_substr("search phrase", 6), ($temp->substr)("search phrase", 6));

Output for 7.2.29 - 7.2.34, 7.3.0 - 7.3.33: Parse error: syntax error, unexpected 'Closure' (T_STRING), expecting function (T_FUNCTION) or const (T_CONST) in /in/Wmqru on line 5
Process exited with code 255.
Output for 7.4.4 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.34, 8.3.0 - 8.3.35: string(7) " phrase" string(7) " phrase" string(2) " p" string(7) " phrase" string(7) " phrase"
Output for 8.4.1 - 8.4.26, 8.5.0 - 8.5.11: Deprecated: {closure:StringFunctionMapper::setSingleByte():11}(): Implicitly marking parameter $length as nullable is deprecated, the explicit nullable type must be used instead in /in/Wmqru on line 11 Deprecated: {closure:StringFunctionMapper::setMultiByte():19}(): Implicitly marking parameter $length as nullable is deprecated, the explicit nullable type must be used instead in /in/Wmqru on line 19 string(7) " phrase" string(7) " phrase" string(2) " p" string(7) " phrase" string(7) " phrase"

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