Manipulating substrings with the substr function
Manipulating substrings with the substr function
- Sometimes, you want to work with just
part of a string that has been assigned. The substr function
follows the syntax:
$substring = substr([string you want to extract
from], [beginning point of extraction], [length
of the extracted value]);
- For instance, to assign "Sol" to the
scalar variable $last_name you would use the following code:
$name = "Selena Sol";
$last_name = substr ($name, 7, 3);
- The substr function takes the scalar
variable $name, and extracts three characters beginning with the
seventh.
| Warning: as in array
indexing, the substr function counts from zero, not from one.
Thus, in the string "Gunther", the letter "t" is actually
referenced as "3" not "4". Also note that the final number
(length of extracted value) is not necessary when you want to
grab everything "after" the beginning character. Thus, the
following code will do just what the previous did since we are
extracting the entire end of the variable $name:
$last_name = substr ($name, 7); |
Finding the length of a scalar variable with the length function
Table of Contents
Scalar variable naming conventions
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