PHP Function Application Scenario

Intercept file suffix:

$slen = strlen ($suffix);

substr ($this->uri_string,-$slen) = = = $suffix

Principle: Intercept How many length characters are counted

To determine if a multidimensional array variable exists:

Isset ($this->config[$index], $this->config[$index] [$item])

Open a file, that is, create a file

' A ' writes open, pointing the file pointer at the end of the file. If the file does not exist, try to create it.

' B ' for portability, it is strongly recommended that you always use the ' B ' tag when opening a file with fopen () .

if (! $fp = @fopen ($filepath, ' ab ')) {
return FALSE;
}

Get part of the content

String substr ($str, $start, $length);

Array Array_slice ($arr, $offset, $length);

PHP Function Application Scenario