substr_compare

Definition and usage

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

Tip: This function is binary safe and selectively case sensitive.

Example

Example 1

Compare two strings:

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

Try it yourself

Example 2

Compare two strings, when the start position for comparison in string1 is 6:

 <?php
echo substr_compare ( "Hello world" , "world" , 6 ) ;
?>

Try it yourself

Example 3

Use all parameters:

 <?php
echo substr_compare ( "world" , "or" , 1 , 2 ) ;
echo substr_compare ( "world" , "ld" , - 2 , 2 ) ;
echo substr_compare ( "world" , "orl" , 1 , 2 ) ;
echo substr_compare ( "world" , "OR" , 1 , 2 , TRUE ) ;
echo substr_compare ( "world" , "or" , 1 , 3 ) ;
echo substr_compare ( "world" , "rl" , 1 , 2 ) ;
?>

Try it yourself

Example 4

Different return values:

 <?php
echo substr_compare ( "Hello world!" , "Hello world!" , 0 ) ; // Two strings are equal
echo substr_compare ( "Hello world!" , "Hello" , 0 ) ; // string1 is greater than string2
echo substr_compare ( "Hello world!" , "Hello world! Hello!" , 0 ) ; // string1 is less than string2
?>

Try it yourself

grammar

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