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--- uphp:functions:is_string [2017/04/06 12:46]
jeff
+++ uphp:functions:is_string [2021/09/13 05:57]
@@ Line 1: / Line 1: @@
-======is_string======
-<badge>WMPRO, WMMINI FW >= 1.0</badge> <badge>WMMEGA FW >= 2.0</badge>
-Check if a variable is a <html><b><span style="color:green">string<span style="color:black"></b></html>
-====Description====
-<well size="sm">
-<html>
-<span style="font-size:125%;color:green">int
-<span style="color:black">
-</html>
-[[is_string]] (
-<html>
-<span style="color:green">mixed
-<span style="color:blue">$variable
-<span style="color:black">)
-</html>
-</well>
-Check to see if a variable or value is of type <html><b><span style="color:green">string<span style="color:black"></b></html>
-====Parameter====
-<html><b><span style="color:blue">$variable<span style="color:black"></b></html>:  Variable or expression to be evaluated
-====Return Value====
-(true) if a <html><b><span style="color:green">string<span style="color:black"></b></html>, 0 (false) if not a string
-====Examples====
-<code php>
-<?
-  $x=1.0;
-  print(is_string($x)); // outputs 0, $x is a float
-  $y="1.0";
-  print(is_string($y)); // outputs 1, $y is a string
-  $z=''
-  print(is_string($z)); // outputs 1, $z is an empty string
-?>
-</code>
-====Notes====
-This function checks ONLY the type of the variable, not the data that it holds!
-====See Also====
-[[is_int()]] - Check if a variable is an <html><b><span style="color:green">integer<span style="color:black"></b></html>
-[[is_float()]] - Check if a variable is a <html><b><span style="color:green">float<span style="color:black"></b></html>
-[[is_numeric()]] - Check if a value is numeric (<html><b><span style="color:green">int<span style="color:black"></b></html>, <html><b><span style="color:green">float<span style="color:black"></b></html> or numeric <html><b><span style="color:green">string<span style="color:black"></b></html>)
-[[is_array()]] - Check if a variable is an <html><b><span style="color:green">array<span style="color:black"></b></html>
-[[isset()]] - Check if a variable exists
-[[uphp:variables|uPHP Variable Types and Limits]]

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