Strings in PHP

In this tutorial we will learn about Strings in PHP. String are commonly described as collection of character. Mean a string is collection of number, alphabets or special symbols for example "Hello Word". In PHP you can define string in program with two ways by using single quotes(' ') or by using double(" ") quotes. In this tutorial we learn about strings, basic functions in strings, escape-sequence and difference between single and double quote string.

Strings in PHP

Differenene between Single and Double Quote Strings: As I said we can write strings in PHP in both single and double quotes. But there is certain difference between both. If you write string in single quotes it will take string literally. Suppose you have a variable $num=10; and if you weirte somthing like this 'Value of num=$num'. In this case it will show exactly the same. But if you will wite this in double quotes the variable name will changed with its value. To understand it more clearly follow the given example.


Escape-Sequence in strings: These are some special escape sequence in PHP which we can use with strings. These escape sequence get replace with special values. Check these escape sequence.

  • \n is replaced with the newline character.
  • \\ is replaced with a single backslash. (\)
  • \r is replaced with the carriage-return character.
  • \t is replaced with the tab.
  • \" is replaced with a single double-quote (").
  • \$ is replaced with the dollar sign itself ($).

Basic string Functions: Here we will check some of the basic functions with would so helpful to you while working with strings. Here is like of some basic sting functions in PHP.

  • strlen() : function to check total number of characters in string.
  • str_replace() : function to replace part or parts of string with other string.
  • str_word_count() : function to check total number of words in string.
  • strrev() : function to reverse string in PHP.

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