What does the slash in php mean?

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There are two kinds of slashes in php: 1, the forward slash "/" symbol, which is equivalent to a parenthesis wrapped around the content; 2, the backslash "\" symbol, which indicates the escape character.

This article operating environment: Windows7 system, PHP7.1 version, DELL G3 computer

The difference between php forward slash'/ 'and backslash'\'

$val = preg_replace ('/ ([\ x00 -\ x08,\ x0b -\ x0c,\ x0e -\ x19]) /',', $val)

A positive diagonal bar is used to wrap the content in parentheses.

The backslash is:

Marks the next character as a special character, or a literal character, or a backward reference, or an octal escape character.

For example,'n 'matches the character "n".' \ n' matches a newline character. The sequence'\ 'matches "\" and "(" matches "(".

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