Home >Backend Development >PHP Tutorial >Mobile app interface programming technology - learn to implement PHP strings

Mobile app interface programming technology - learn to implement PHP strings

WBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWB
WBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOriginal
2016-07-30 13:31:24989browse

  • Single quotes, double quotes

In PHP, the definition of a string can use English single quotes ' ' or English double quotes " ". However, PHP allows us to include string variables directly within double-quoted strings. The content in single quote strings is always considered to be ordinary characters.

<code><span>$str</span>=<span>'hello'</span>;
<span>echo</span><span>"str is <span>$str</span>"</span>; //运行结果: str is hello
<span>echo</span><span>'str is $str'</span>; //运行结果: str is <span>$str</span></code>
  • Concatenation of strings

Use English dots in PHP to connect two strings.

<code><span><span><?php</span><span>$i</span>=<span>'I'</span>;
<span>$love</span>=<span>' Love'</span>;
<span>$you</span>=<span>' You'</span>;
<span>//连接一下三个字符串</span><span>echo</span><span>$i</span>.<span>$love</span>.<span>$you</span>;
<span>?></span></span></code>
  • Remove spaces from the beginning and end of a string

    There are three functions in PHP that can remove spaces from a string
    trim removes spaces from both ends of a string.
    rtrim is to remove the spaces on the right side of a string, where r is the abbreviation of right.
    ltrim removes spaces from the left of a string, where l is the abbreviation of left.

<code><span><span><span><?php</span><span>//</span><span>$str</span>=<span>"      空格要去掉      "</span>;

<span>echo</span><span>"jar"</span>.trim(<span>$str</span>).<span>"len"</span>.<span>"<br>"</span>;

<span>echo</span><span>"jar"</span>.ltrim(<span>$str</span>).<span>"len"</span>.<span>"<br>"</span>;

<span>echo</span><span>"jar"</span>.rtrim(<span>$str</span>).<span>"len"</span>.<span>"<br>"</span>;

<span>?></span></span></span></code>

Copyright Statement: This article is an original article by the blogger and may not be reproduced without the blogger's permission.

The above introduces the mobile app interface programming technology - learning to implement PHP strings, including aspects of the content. I hope it will be helpful to friends who are interested in PHP tutorials.

Statement:
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn