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This article will explain in detail how php replaces strings with given stator strings. The content of the article is of high quality, so the editor will share it with you for reference. I hope you will have some understanding of the relevant knowledge after reading this article.

Replacement method: 1, use "substr_replace (string, replace value, start position, replace length)" statement; 2, use "str_replace (search value, replace value, string)" statement; 3, use "str_ireplace (search value, replace value, string)" statement.

Operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

Method 1: use the substr_replace () function

The substr_replace () function replaces part of a string with another string.

The syntax of the substr_replace () function is as follows:

Mixed substr_replace (mixed $string, mixed $replacement, mixed $start [, mixed $length])

This function takes three required arguments, $string, $replacement (replacement value), and $start (where the replacement begins), an omitted argument $length (the number of characters to replace).

The substr_replace () function can replace substrings qualified by the $start and $length parameters with $replacement in a copy of the string $string.

To put it simply, replace the number of characters of $start with the value of $length starting at the position of $replacement (note that the position of the string starts at 0).

Example:

Method 2: use the str_replace () function

The str_replace () function replaces some characters in the string with other characters (case sensitive).

Syntax:

Str_replace ($search,$replace,$string,$count)

This function can be case-sensitive to some characters in the replacement string; it takes three required arguments, $search (the substring to search for), $replace (the value to replace), $string (the string), and an omitted parameter $count (a variable).

Example:

Method 3: use the str_ireplace () function

The str_replace () function replaces some characters in the string (case sensitive).

Syntax:

Str_ireplace ($search,$replace,$string,$count)

This function can ignore some characters in the uppercase and lowercase replacement string, and this function accepts the same parameters as the str_replace () function, the first three arguments are required (cannot be omitted), and the second parameter, $count, can be omitted (but if set, you can get the number of replacements).

The parameter $count accepts a variable to count the number of substitutions; if this parameter is set, you can know how many substitutions have been performed.

Example:

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