The way PHP retrieves the number of a string is to pass the string as a parameter to the substr function, and set the starting point and the length of the string to be returned, for example [substr("Hello world", 6)].
The operating environment of this article: windows10 system, php 7.3, thinkpad t480 computer.
php has a very rich function library, including a function substr(), which can take out any part of the string. Returns FALSE on failure, or an empty string.
Syntax:
substr(string,start,length)
Parameters:
string Required. Specifies a part of the string to be returned.
#start Required. Specifies where in the string to begin.
#length Optional. Specifies the length of the string to be returned. The default is until the end of the string.
Code example:
<!DOCTYPE html>
<html>
<body>
<?php
echo substr("Hello world",6);
?>
</body>
</html> Running result:
world
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