PHP substr function string truncation usage analysis, phpsubstr_PHP tutorial

PHP substr function string truncation usage analysis, phpsubstr. Analysis on the use of substr function string truncation in PHP. phpsubstr this article describes the use of substr function string truncation in PHP. For your reference, we will share the following details: analysis of the substr function string truncation usage in subs PHP in PHP, phpsubstr

This example describes how to intercept the substr function string in PHP. We will share this with you for your reference. The details are as follows:

The substr function in PHP is defined as follows:

Substr (string, start, length)

Parameters are described as follows:

String is required. Specifies that a part of the string is to be returned.

Start
Required. Specifies where the string starts.
Positive number-start at the specified position of the string
Negative number-start at the specified position starting from the end of the string
0-start at the first character in the string

Length

Optional. Specifies the length of the string to be returned. The default value is until the end of the string.
Positive number-length returned from the position of the start parameter
Negative number-length returned from the end of the string

The sample code is as follows:

<? Php echo substr ("Welcome to www.jb51.net! ", 0); // output as is, no echo is intercepted"
"; Echo substr (" Welcome to www.jb51.net! ", 4, 14); // A string of 14 consecutive echo characters starting from 4th characters"
"; Echo substr (" Welcome to www.jb51.net! ",-4th); // 4 characters of echo are intercepted starting from the last"
"; Echo substr (" Welcome to www.jb51.net! ", 0,-4); // starts from the first character, and is truncated to the last 4th characters?>

The running result is as follows:

Welcome to www.jb51.net!ome to www.jb5net!Welcome to www.jb51.

I hope this article will help you with PHP programming.

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Examples in this article describes the use of the substr function string truncation in PHP. Share it with you for your reference. The details are as follows: subs in PHP...