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substr(string $str, int $start, int $length = null): string|false

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mb_substr(string $str, int $start, int $length = null, string $encoding = null): string|false

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$str = "Hello World";
$result = substr($str, 0, 5);
echo $result; //Êä³ö¡°Hello¡±

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$str = "ÄãºÃ£¬ÌìÏÂ";
$result = mb_substr($str, 0, 2, "UTF-8");
echo $result; //Êä³ö¡°ÄãºÃ¡±

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Str::limit($value, $limit = 100, $end = ‘…’)

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Str::limit('The quick brown fox jumps over the lazy dog', 20); // The quick brown fox...

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Str::substr($string, $start, $length = null)

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Str::substr('Hello world', 0, 5); // Hello

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Str::before($subject, $search)

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Str::before('hello world', 'world'); // hello

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Str::after($subject, $search)

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Str::after('hello world', 'hello '); // world

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Str::replaceFirst($search, $replace, $subject)

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Str::replaceFirst('the', 'a', 'the quick brown fox jumps over the lazy dog'); // a quick brown fox jumps over the lazy dog

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Str::replaceLast($search, $replace, $subject)

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Str::replaceLast('the', 'a', 'the quick brown fox jumps over the lazy dog'); // the quick brown fox jumps over a lazy dog

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Str::snake($value, $delimiter = ‘_’)

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Str::snake('HelloWorld'); // hello_world

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Str::camel($value)

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Str::camel('hello_world'); // helloWorld

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Str::ucfirst($string)

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Str::ucfirst('hello world'); // Hello world

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