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Description
string substr ( string string, int start [, int length] )
substr() returns the portion of string specified by the start and length parameters.
If start is non-negative, the returned string will start at the start'th position in string, counting from zero. For instance, in the string 'abcdef', the character at position 0 is 'a', the character at position 2 is 'c', and so forth.
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