PHP substr Function

The substr function in PHP is used to retrieve a portion of the string. The syntax of the substr function is:

substr ('string', position_start, substr_length)

where position_start is the starting point (the first character has a position of 0). if position_start is a negative number, the starting position is the -(position_start)th character from the end. substr_length is the length of the string to be returned. If substr_length is a negative number, that means substr_legnth characters will be omitted from the end of the string.

Let's take a look at the examples below:

Example 1

print substr('PHP substr is a substring function', 5, 3);

Result:

ubs

Example 2

print substr('PHP substr is a substring function', -5, 3);

Result:

cti

Example 3

print substr('PHP substr is a substring function', 11, -5);

Result:

is a substring fun

11 means the returned string starts at the 11th position, which is "i" in is. -5 means the last 5 characters in the string are omitted.

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