Is substr_compare() case sensitive in php?

PHP substr_compare() function

##Definition and usage

substr_compare() function compares two strings from the specified starting position.

Tip: This function is binary safe and optionally case sensitive (case sensitive).

Grammar (Recommended learning: PHP video tutorial)

substr_compare(string1,string2,startpos,length,case)

Parameter description:

string1 , required. Specifies the first string to compare.

string2 , required. Specifies the second string to be compared.

startpos, required. Specifies where in string1 to start comparison. If negative, counting starts from the end of the string.

length, optional. Specifies how many characters in string1 are compared (number of characters).

case, optional.

Boolean value specifying whether to perform case-sensitive comparisons:

FALSE - Default. Case sensitive

TRUE - Not case sensitive

This function returns:

0 - If the two strings are equal

e63aabeb0339d3bb08f16fffcf1b80a20 - if string1 (startpos) is greater than string2

if length is greater than or equal to string1 length, the function returns FALSE.

Example:

<?php
echo substr_compare("Hello world","Hello world",0);
?>

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