{"id":7294,"date":"2019-10-21T05:10:54","date_gmt":"2019-10-21T05:10:54","guid":{"rendered":"https:\/\/www.devopsschool.com\/blog\/?p=7294"},"modified":"2021-11-16T05:45:13","modified_gmt":"2021-11-16T05:45:13","slug":"complete-reference-guide-of-php-strings","status":"publish","type":"post","link":"https:\/\/www.devopsschool.com\/blog\/complete-reference-guide-of-php-strings\/","title":{"rendered":"Complete reference guide of PHP Strings!"},"content":{"rendered":"\n
What is String in PHP<\/h2>\n\n\n\n
A string is a sequence of letters, numbers, special characters and arithmetic values or combination of all. The simplest way to create a string is to enclose the string literal (i.e. string characters) in single quotation mark<\/p>\n\n\n\n
$my_string = ‘Hello World’; <\/p>\n\n\n\n
You can also use double quotation marks (“). However, single and double quotation marks work in different ways. Strings enclosed in single-quotes are treated almost literally, whereas the strings delimited by the double quotes replaces variables with the string representations of their values as well as specially interpreting certain escape sequences.<\/p>\n\n\n\n
The escape-sequence replacements are:<\/p>\n\n\n\n
\\n<\/code> is replaced by the newline character<\/li>
\\r<\/code> is replaced by the carriage-return character<\/li>
\\t<\/code> is replaced by the tab character<\/li>
\\$<\/code> is replaced by the dollar sign itself ($<\/code>)<\/li>
\\\"<\/code> is replaced by a single double-quote (\"<\/code>)<\/li>
\\\\<\/code> is replaced by a single backslash (\\<\/code>)<\/li><\/ul>\n\n\n\n
PHP provides many built-in functions for manipulating strings like calculating the length of a string, find substrings or characters, replacing part of a string with different characters, take a string apart, and many others. Here are the examples of some of these functions.<\/p>\n\n\n\n
Calculating the Length of a String<\/h2>\n\n\n\n
The strlen()<\/code> function is used to calculate the number of characters inside a string. It also includes the blank spaces inside the string.<\/p>\n\n\n\n
Counting Number of Words in a String<\/h2>\n\n\n\n
The str_word_count()<\/code> function counts the number of words in a string.<\/p>\n\n\n\n
<?php $my_str = ‘The quick brown fox jumps over the lazy dog.’; echo str_word_count($my_str); ?> \/\/ Outputs: 9 <\/p>\n\n\n\n
Replacing Text within Strings<\/h2>\n\n\n\n
The str_replace()<\/code> replaces all occurrences of the search text within the target string.<\/p>\n\n\n\n
<?php $my_str = ‘If the facts do not fit the theory, change the facts.’; echo str_replace(“facts”, “truth”, $my_str); \/\/ Display replaced string ?> <\/p>\n\n\n\n
The output of the above code will be:If the truth do not fit the theory, change the truth.<\/p>\n\n\n\n
You can optionally pass the fourth argument to the str_replace()<\/code> function to know how many times the string replacements was performed, like this.<\/p>\n\n\n\n
<?php $my_str = ‘If the facts do not fit the theory, change the facts.’; \/\/ Perform string replacement str_replace(“facts”, “truth”, $my_str, $count); \/\/ Display number of replacements performed echo “The text was replaced $count times.”; ?> <\/p>\n\n\n\n
The output of the above code will be:- The text was replaced 2 times. <\/p>\n\n\n\n
Reversing a String<\/h2>\n\n\n\n
The strrev()<\/code> function reverses a string.<\/p>\n\n\n\n
<?php $my_str = ‘You can do anything, but not everything.’; echo strrev($my_str); \/\/ Display reversed string ?> <\/p>\n\n\n\n
The output of the above code will be:- .gnihtyreve ton tub ,gnihtyna od nac uoY <\/p>\n\n\n\n