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This article mainly explains "how to quickly master PHP string replacement", the content of the article is simple and clear, easy to learn and understand, the following please follow the editor's ideas slowly in depth, together to study and learn "how to quickly master PHP string replacement" bar!

Substr_replace () function-replace part of a string

To replace part of a string in PHP, you can use the substr_replace () function provided by PHP. The basic syntax format of the substr_replace () function is as follows:

Substr_replace (string,replacement,start,length)

It should be noted that the parameter string represents the string to be replaced, the parameter replacement represents the string to be inserted, that is, the string to be replaced, the parameter start represents the replacement string from that position, and the parameter length represents the length of the replacement.

If the parameter start is positive, the replacement position is calculated from the position of the parameter start. If the parameter start is negative, the replacement position of the parameter starts from the end to the position of start. If it is 0, then start from the first position.

If the parameter length is positive, it indicates the length of the number of characters to be replaced, if it is negative, it indicates the number of characters at the end of the substring to be replaced from the end of the string, and if 0 indicates direct insertion rather than replacement. Also, if start is negative and length is less than or equal to start, then length is 0.

The result returned by this function is the string to be replaced.

Let's take a look at the use of the substr_replace () function through an example, as follows:

Output result:

In the above example, you can complete part of the replacement string through the substr_replace () function, so let's take a look at the use of the str_replace function.

Str_replace function

We have been able to replace part of a string with another string through the substr_replace () function above, while the str_replace function can replace some characters in a string with one string. The basic syntax format of the str_replace function is as follows:

Str_replace (find,replace,string,count)

It should be noted that the parameter find represents the value to be found, the parameter replace represents the value to be replaced, the parameter string represents the string specified to be searched, and the parameter count represents the variable that counts the number of substitutes.

The return value of this function is a string or array with a replacement value. Let's take a look at the use of the str_replace function through an example, as shown below:

Output result:

In the above example, one string is used to replace some other characters in the string with the str_replace function. Let's look at another example:

Output result:

So using the str_replace function with fewer elements that need to be replaced than the ones found.

Both the str_replace function and the substr_replace () function above can achieve the purpose of replacing strings. If you are doing case-insensitive search and replacement, it is recommended to use the str_ireplace () function.

Thank you for reading, the above is the content of "how to quickly master the replacement of PHP strings". After the study of this article, I believe you have a deeper understanding of how to quickly master the replacement of PHP strings, and the specific use needs to be verified in practice. Here is, the editor will push for you more related knowledge points of the article, welcome to follow!

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