PHP compares two strings of function Substr_compare () from a specified starting position

Instance

Comparison of two strings:

<?phpecho substr_compare ("Hello World", "Hello World", 0);? >

Definition and usage

The Substr_compare () function compares two strings from a specified starting position.

Tip: This function is binary safe and selective case-sensitive.

Grammar

Substr_compare (String1,string2,startpos,length,case)

Parameters	Describe
String1	Necessary. Specifies the first string to compare.
string2	Necessary. Specifies a second string to compare.
Startpos	Necessary. Specify where in the string1 to begin the comparison. If negative, the count starts at the end of the string.
Length	Optional. Specifies the number of characters to participate in the comparison in string1.
Case	Optional. A Boolean value that specifies whether a case-sensitive comparison is performed: FALSE-Default. Case sensitive TRUE-Case insensitive

technical details

return value:	This function returns: 0-if two strings are equal <0-if string1 (from start position startpos) is less than string2 >0-if string1 (startpos from start) is greater than string2 if length is greater than or equal to the length of string1, the function returns FALSE.
php version:	5+
update log:	from PHP 5.1, negative startpos are allowed.

More examples

Example 1

Compares two strings when the starting position for comparison in string1 is 6 o'clock:

<?phpecho substr_compare ("Hello World", "World", 6);? >

Example 2

Use all the parameters:

<?phpecho Substr_compare ("World", "or",;); echo Substr_compare ("World", "LD", -2,2); echo Substr_compare ("World", "ORL",); echo Substr_compare ("World", "OR", 1,2,true); echo Substr_compare ("World", "or", 1, 3); echo Substr_compare ("World", "RL"); >

Example 3

Different return values:

<?phpecho substr_compare ("Hello world!", "Hello world!", 0); The strings is Equalecho substr_compare ("Hello world!", "Hello", 0); String1 is greater than String2echo substr_compare ("Hello world!", "Hello world! Hello! ", 0); STR1 is less than str2?>