| @@ 2304-2312 (lines=9) @@ | ||
| 2301 | * @return static  | 
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| 2302 | * <p>Object with all characters of $str being lowercase.</p>  | 
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| 2303 | */  | 
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| 2304 | public function toLowerCase($tryToKeepStringLength = false, $lang = null): self  | 
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| 2305 |     { | 
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| 2306 | return static::create(  | 
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| 2307 | $this->utf8::strtolower(  | 
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| 2308 | $this->str,  | 
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| 2309 | $this->encoding,  | 
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| 2310 | false,  | 
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| 2311 | $lang,  | 
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| 2312 | $tryToKeepStringLength  | 
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| 2313 | ),  | 
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| 2314 | $this->encoding  | 
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| 2315 | );  | 
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| @@ 2404-2410 (lines=7) @@ | ||
| 2401 | * @return static  | 
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| 2402 | * <p>Object with all characters of $str being uppercase.</p>  | 
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| 2403 | */  | 
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| 2404 | public function toUpperCase($tryToKeepStringLength = false, $lang = null): self  | 
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| 2405 |     { | 
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| 2406 | return static::create(  | 
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| 2407 | $this->utf8::strtoupper($this->str, $this->encoding, false, $lang, $tryToKeepStringLength),  | 
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| 2408 | $this->encoding  | 
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| 2409 | );  | 
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| 2410 | }  | 
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| 2411 | ||
| 2412 | /**  | 
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| 2413 | * Returns a string with whitespace removed from the start and end of the  | 
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