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PHP | substr_compare() Function

PHP substr_compare() Function

Hello folks! welcome back to a new edition of our tutorial on PHP. In this tutorial guide, we are going to be studying about the PHP substr_compare() Function.

The substr_compare() Function is used to compare two strings from a specified start position.

Note: This PHP function is binary-safe and optionally case-sensitive.


Following below is the syntax to use this function -


Parameter Details

Sr.NoParameters & Description


It is used to first string to compare



It is used to second string to compare



It specifies where to start string comparing in string1



It specifies length of a string



The boolean value that specifies where to perform a case-sensitive compare

Return Value

This PHP function returns:

  • 0 if the two strings are equal.
  • <0 if string1 (from starting position) is less than string2.
  • >0 if string1 (from starting position) is greater than string2.
If length is equal or greater than the length of string1, this function returns FALSE.


Try out the example below -

   echo substr_compare("READ WRITE","WRITE",8);


When the above code is executed, it will produce the following result -


Alright guys! This is where we are going to be rounding up for this tutorial post. In our next tutorial, we will be studying about the PHP substr_count() Function.

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