Phptrim deletes space characters and specified characters

I didn't see the trim function before. I thought it could only delete the blank space. today I found that it can also delete quot;-null. quot; tquot;-tab, quot; nquot;-newline ,... I didn't see the trim function before and thought that it could only delete the blank space. today I found that it can also delete ""-null.

"T"-tab, "n"-new line, "x0b"-vertical list operator, "r"-press enter, ""-common blank characters, and user-specified characters.

Definition and usage: the trim () function removes white spaces and other pre-defined characters from both ends of the string. (optional) specifies the string to be converted. If this parameter is omitted, all the following characters are deleted:

""-Null, "t"-tab, "n"-new line, "x0b"-vertical list operator, "r"-press enter, ""-common blank characters, the instance code is as follows:

 {$ Str}

";// "; Echo $ str1;

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